I can fill in this one - I used to be a fan of ImAllexx (I even thought he was attractive once), and I never really understood the vitriol he got for what I thought was just being a fairly lazy, ill-informed channel - its obvious now his ruthless, bridge-burning fecklessness has caught up with him.
Trollzous (
https://www.youtube.com/c/trollzous/videos) was another commentry Youtuber who was in the same space as Alex (though more popular), and was accused by his girlfriend (who was frankly, a glorified e-whore, or 'thot' as I believe the young people call it) of outright rape. Nothing was ever proven, it was he said, she said, but he basically had to disappear shortly after. I remember this because these allegations became mainstream just after he was in a livestream with Mr. Beast back when he was doing one of his 24 hour wasting-my-life challenges, and after he had chimed in to Mr. Beast's livestream, he was in a debate between Durv and Exlility, two teenage youtubers that were blowing up at the time due to horrendous use of misleading and outright false clickbait. Alex entered the call for a few seconds - literally, said hi and then bugged off, acting like they were great mates. It was probably one or two weeks later, in ImAllexx's own livestream, he was asked about Trollzous and simply said "I don't talk to [him] anymore." I don't think he never mentioned him again, and now it's like he never existed.
Also on Durv, Alex made a video making fun of him (which even today I thought was his best video). They become friendly - which was obviously because Durv was blowing up because of his abusive tactics, including pretending to give away gift cards. When his channel was terminated, he was interviewed by Alex on his old podcast, and when he asked him if the reason he was terminated was due to the fake cards, he said no, and Alex just accepted it and took his side. Even then it was just astonishing how he was willing to enable this twelve-year old kid's bullshit for naked self-advancement - over practices he'd just criticised. It was around this point that I stopped watching him.
I don't know much about Solid Shibe, but he was an 'meme' channel, in the same vein as Dolan Dark, and apparently had some issues with a girl that wasn't his girlfriend (it's really not clear what happened) but he had to go bye-bye. He and Alex have hung out together in person in L.A, I think there might still be some pics with them around acting all touchy feely with each other. Again, its like he never existed, and now has a channel dedicated to his actual shiba.
There was another channel, Sinn0H, who was close friends with Alex but had to quit because he was trying to be a really rubbish version of Colossal is Crazy and nobody liked it. He now has a big ASMR channel. I don't know if Alex had anything to do with him quitting but his old twitter suggests they were very close.
https://twitter.com/sinn0halt?lang=en
Basically, ImAlexx's holding pattern of simply abandoning people when they become less relevant or become too toxic has held since Zaptie and I've always wondered if it was because this particular event hurt him emotionally. He sent out a pretty emotional (and very quickly deleted) tweet when the allegations first surfaced that read something like "If you make a video on Zaptie. consider yourself fucking done on this website." A (formerly) mutual friend BradDoesBanter mentioned that they were best friends, spending days together alone in Skype or Discord, and when the allegations broke out, Alex was crying about it constantly. Because both of them are bisexual I did wonder they had something somewhat closer than a friendship, which would have made Alex's foolish reaction a little more understandable - the justification at the time, if I remember, was that they were trying to get ahead of the story and spin it out positively by emphasising his 'psychopathy', but ended up making him look much worse.
As another juicy aside, BradDoesBanter (who again, is a discarded friend) mentions on his own podcast that in real life, Alex is an utter social reject, who can only converse with people about gossip about other youtubers, including knowledge that he shouldn't legally be privy too. After Pyrocynical's parents Pulp-Fictioned him out of his event, he was apparently stuck with Brad for the rest of the day - even his fellow e-boys apparently don't like him. In a later episode, Brad mentions he 'pretends' to be bisexual.