I still dont know what Gamergate is.
Gamergate was a lot of gamers pushing back on the woke culture making its way to video games and other various forms of nerd culture. "They" were making nerd culture way more PC, which could have been acceptable but it was a pretty blatant and apparent push that didn't produce quality products. Like if the PC content was good/fun/enjoyable it would have been fine. Instead a lot of things were "ruined".
A lot of preexisting characters had their gender specific traits cut back. Tomb Raider losing her triangle tits, and various fighters losing their muscles.
Violence got cut down, and becoming very unrealistic/unsatisfying
no bad guy was ever LGTBQ+, and most of the good characters became LGTBQ+. It became a trope of when you were early in a game/movie/comic/story/whatever and hadn't figured who the bad guy was yet, it was the straight guy. On its own, not a real issue, it was just done in such a boring, predictable way.
It hit everything from triple AAA games, to various indie efforts, to existing franchises with decades of history. None of the existing stuff was sacred, and that ticked off the core support for most of these things.
besides the content itself, there was a big push for inclusion amongst the staff of various nerd culture related items, and they became untouchable because they were "different". IIRC one of the big sparks was this one reviewer who wrote for several of the big game reviewers was giving obviously biases reviews, just down right bad, wrong, and people wondered if this person even made it past the start menu with how inaccurate the reviews were. Good or bad reviews were just as wrong. so there was a push to out her based on the quality of her work, but there was woke push back because she fit one of the categories.
besides the reviews its when a lot of game developers started going to "public betas" where they release a game early and let the public "play test", which was really just replacing their QA/QC. but it was because a ton of the QA/QC time was spent focusing on whatever woke agenda was present in the game. Another trope was "well the game is buggy as hades, nothing works like it should, half the visual assets don't load, but I know the preferred pronouns of my ingame non-sentient pet, and the transgender cosmetics look great!".
and as others have pointed out, don't go to 4chan unless you want to lose whatever little faith you have in humanity. even if you think you have none, don't go there. at best its trolls trolling other trolls with questionable content and messages.