system
A chat on subreddit /r/PoliticalCompassMemes
human
That's just what happens when your community is centered around a group of people who overwhelmingly seem to spend an inordinate amount of time online and require the affirmation of other people.

It used to be bronies and Homestuck fans that would aggressively try to assimilate into every community they could, but this is just on another level.
gpt
Asimilate implies they want to be a part of what already exists and continue with it. 

No, the word you're looking for is colonise. Cringe fandom enrtyists want to change whatever they get a hold of to center around whatever unhealthy obsession they have.