Can someone please explain what this is?

So There is this community on YouTube that started around 2017-ish where people started making these “logo effects” videos. For example, “nick jr logo bumpers v2 G major” and stuff like that. They seem to always have usernames like “ThomasTheSuperKid5000” and stuff like that along with cartoon character profile pictures. And other parts of the community are into those “goanimate” videos where cailou gets grounded and stuff like that, and then random Nickelodeon preschool shows like “the backyardigans”, “Dora the explorer”, blues clues. And then there’s the dark side of the community, where they make hate/rant videos on popular YouTubers for no reason, hate on random sound effects being overused, and Stuff in videos. I’ve done research on this before, and apparently it’s a community of very young neurodivergent children who make these kinds of videos. Is there any evidence to back this up? I came to this subreddit because I’m still trying to figure out what this community is or what it is called.