I think the correct term here would be "people who create parasocial relationships with random people on the internet" (I know, too big to call it a term). I have seen the same trait in many communities, where people go to insane lengths for their favourite person on the internet. Whether it be Anime community, K-pop community, hell, even some Taylor Swift fans will shock you with their fanaticism.
I do agree that such people exist in Gaming community as well, but comparing games to groups like Neo-Nazis, Scammers who are in their entirety represents the worst (like you cannot differentiate a good Neo-Nazi vs a bad Neo-Nazi or Scammer, all of them as bad), seems to me like making molehill into murderous volcanic mountains.
Umatrix became unmaintained because ublock origin can handle most of its use cases. You just need to run Ublock origin in medium or hard mode. More info ca he found on wiki: https://github.com/gorhill/uBlock/wiki/Blocking-mode:-medium-mode