EDIT: Because I do have a few more I failed to mention.
Nostalgia Critic - I used to watch him on-and-off again even if I didn't like him. It was until February 2018 when I stopped watching him for good, not because of ChangeTheChannel really (this was a month prior).
Turkey Tom - Became a huge prick by the end of last year. (EDIT: Disregard that, I suck cocks!)
Boogie2988 - Stopped watching by 2017 after he was making excuses after excuses.
Jim Sterling - He does make some decent points at times, but his decent points are literal deja vu, repeating the same points over and over as if we are dumb to understand.
videogamedunkey - His videos became hot garbage by 2017 or 18.
Skeptic commentary community (Mundane Matt, Sargon, Armored Skeptic, sh0e0nhead, Quartering, G+G, MR. OBVIOUS, No BS) - Stopped watching once they became obvious lolcows themselves.
Quinton Reviews - I stopped watching his content I think after his Thinning 2 or his deleted Knockoff YouTubers episode of angry reviewers. He became less energetic and more of a lolcow overnight.
Saberspark - I was unsurprised that he keeps revealing about his cringe as hell brony furry bullshit thus his shtick got old real quick.
CinemaSins - Shticks of where he nitpicks and find flaws in specific movies got old so fast.
CinemaWins - Same reason as Sins (being the more defensive alternative). He also became completely woke with stuff like his dumbass BLM video during the civil riots that happened almost a year ago.
MeatCanyon - supported BLM by using people to donate NAACP funds during the Civil riots almost a year ago. We tend to forget his content was by-and-large edgy, and now he's turned himself into a safe content creator.
Rev from Vinesauce - Supported BLM with his retarded stream where people could donate NAACP funds during the riots. Plus his videos are boring and unfunny compared to either Vinny or Joel which had more heart and soul.
Slideshow CC (Doodletones, YBF91, etc.) - They became lolcows overnight. Also I just wanted to distance away from the community because at one point, I was one of them.
Chuggaaconroy - Pretty boring and stale let's plays to get through.
OverSimplified - Painfully middle-age dad-tier jokes that distracted his world history research.
Rooster Teeth and Machinima - I'm glad these companies are burning to flames for being shells of their former selves. They used to be exclusive homes of internet kino like Arby and the Chief, Red vs. Blue, Sanity Not Included, and GMod videos (Yes, I am well aware folks like DSP and Wings were on board as well). What the hell happened?
CollegeHumor - Once upon a time, they made good videos. Since 2013, they forgone good quality in favor of WatchMojo-esque bullshit.
Most YTP-ers (SuperYoshi, DiscoGlacier, TheOneManBoxOffice, etc.) - Most who were on YouChew. Also, this is speaking from myself who got tired of the YTP community myself. There are other YTP-ers who are putting decent content time to time, but the rest are no-go for me.
idubbbz - He started decently with his Content Cop and Kickstarter Crap. It's all downhill once he moved past all that in favor of mediocre bullshit.
Metokur - I stopped giving a shit by 2019, until months later when he streamed his coronavirus streams. Other than that, his content became stale and worthless.
ThatCreepyReading - Once a decent creepypasta channel has long turned into a "feel sorry for me" channel, plus he tends to hop on popular trends that age like milk such as hating ProJared or Emoji Movie.
SuperMega - Made a retarded podcast episode promoting civil riots and defending BLM. His show was dedicated to edgy jokes and now the crew is trying hard to be safe for YouTube. Guess Cali got to these guys.
Schaffrilas - I am not interested into your Smash videos or your DreamWorks/Pixar tier-list. His old YTPs were quite good though.
Cosmonaut - hurr durr mcu good consoom product.
YMS, IHE, and ralphthemoviemaker - They became stale real quick beginning last year what with repetitive nitpicking.
Cr1t1kal - His video game commentaries got old real fast. Plus his ranking systems are boring to watch.
Slopes Game Room - His videos are completely boring. Also defended BLM.
Tony Goldmark - I stopped watching in favor of other theme park analysis content creators. Doesn't help that he became butthurt overnight. Also became woke.
DarknesstheCurse - Nostalgia is a bad BAD drug. So yeah, his old videos aged like milk and his newer videos aren't any better as they're literally the same quality as they were before. Not to mention, he as a person is a complete dick.
Mothers Basement - I stopped watching his content by the time he made videos like how to seperate the art from an artist. I'm not saying that he's wrong about such things, it's the quality of the video in question that made me stopped watching altogether.
AniMat - Became an overnight lolcow for consistently bashing on Sony Animation, but defending muh Illumination and live-action Disney remakes for stupid incoherent reasons. Also became woke.
Scott the Woz - His videos put me to sleep because his videos are so boring. Also defended BLM.
Pheolus - His shtick got old and stale real quick and thus I lost interest.
Chris Stuckman - Boring reviews and got butthurt over RedLetterMedia. Also defends nu-Disney for invalid reasons. Also became woke.
Double Toasted - Once was Spill.com, but now it's just Korey Coleman (along with Martin who was one of Spill.com's Leon) who just became boring and a huge insecure prick, such as the time he shat on RLM for hating on Star Wars (both prequels and sequels). Also became woke and defended BLM.
Amazing Atheist - I used to think he was kind of a douche anyway.
Rocked Reviews, Rap Critic, The Rock Critic (Crash Thompson), Anthony Fantano - Obviously pretentious musical elitists. Also became woke.
Midnight's Edge - I used to watch their channel back when they talked about Fantf4stick and Ghostbusters 2016, but since then they've been very boring and lackluster just repeating the same exact news about Disney/Marvel/Stars Wars shtick over and over and I completely roll my eyes. Their "Toy Story 4 problem" was when they lost me.
Critical Drinker - Someone who has decent points, but keeps repeating and hammering down the same points over and over, and also keeps repeating the same unfunny jokes over and over. (EDIT: Disregard that, I suck cocks!)
Elvis The Alien - He's JUST not that funny. Like, at all. If anything, he puts me to sleep. Pretty much the Jimmy Kimmel of movie or DeviantArt analyzing.
24 Frames of Nick - Same tepid, unfunny essay videos over and over about films (some based on childhood) that I surprisingly agree with. He is not wrong, it's that he comes across as unfunny and formuliac and hammers down the exact same points.
Game Grumps - I can't remember when I stopped watching them or why, but I stopped watching long, LONG ago and that's for the best. Plus, regardless of how anyone feels about Sonic (especially nowadays), their hate boner for Sonic in general just feels completely unjustified.
PBG - His content has gotten stale and boring by 2019. I subbed to him again by last year just to see how he was doing and he's still not doing great so I unsubbed again.
Cinema Snob - No reason, I just stopped watching by the end of 2018.
RebelTaxi - No reason, I just stopped watching by the end of last year.
Mr. Enter - Take a hint why I stopped watching after 2014.