This is it. Being on camera is what stops Phil from spending money the literal second he gets it. When he's off-stream he's either drinking, eating Doordash, whaling on WWE Champions or spending dumb shit from Temu. Even his endless Twitter and YouTube sessions need one of the former, he loves spending money.
I admit I can't recall any of the items off the top of my head, but I remember back in the Leanna (or maybe very early Khet) days when he was still waddling around the mall on his day off, he'd sometimes tweet random items with the equivalent of "lol, this is so dumb, right, but wouldn't it be funny if I bought it..." usually followed up by him saying he didn't buy it shortly afterwards when he'd get called out for crying poor and complaining about bills the night before, saying it was just a joke. I think at least one of the times it was some sort of gimmicky bottle of booze, but it was also just like...random garbage, along the lines of the things he throws in the background of his videos or some of his hat gimmicks. I'd bet 9 times out of 10, he totally bought those items and probably posted the pictures post-purchase, and if he did another hoarder closet stream eagle eyed viewers could point them out.
I think it stems from poor impulse control and not having any hobbies. It sorta reminds me of being a kid, when everything feels so new so you jump around from fad to fad until something sticks and that's what you get invested in. Maybe at one point that was actually video games for Phil, he was doing enough with it back in the day that I'd consider it a legitimate hobby for him, but it's been clear for years now that he absolutely hates video games. Even Champions, while it does bring him temporary joy, it's not really the video game aspect of it as much as it is the gambling side of things and the dopamine hit he gets from winning.
One of the interesting parts about the Joon documentary was the look back at old Phil, becuase it's been so long I really forgot/significantly downplayed the fact he used to actually do things. Even something like Project 7, while a total failure and very poorly handled, felt like it was Phil at least wanting to do *something*, even if he was too lazy to really follow through on it. The biggest issue with Phil at this point is he's so socially stunted and toxic, I'm not sure what would even be a good hobby to get into. This is maybe my most optimistic Phil take, but I don't think it's impossible. There's plenty of examples of grumpy loners retiring and initially not knowing what to do with their time, but ultimately finding something they're passionate about. But usually they at least have *something* they're vaguely interested in, even if it takes a little coaxing to figure out what.
With Phil...I genuinely don't know where to begin. I guess just getting him to socialize and make friends would be the starting point, with the way he latched onto KC and him being more open to interviews and stuff, it feels like he's starting to get some idea of how lonely his life actually is. And during the early sidescroller days, he really seemed to hammer in that he was looking forward to just playing Mario Kart with Craig and co. I think Phil's mind would literally be blown if he ever just like, went to a boardgame night or played cards with people.