>>180745
Yeah. But I feel like expanding on your theory a bit, since I've thought about this as well.
For the likes of Sonic, MLP, FNAF, and those types I theorize that it's based on two key factors. Simple base character design and characters that are just prop swaps (eg "this one is black" "this one has a hat" etc).
The simple character designs and inviting childish world invite the autist in as a means of escapism. But not escapism that can still challenge you mentally, it's all incredibly safe and sterile. It's childrens entertainment, not to say it's immature but it was made to be able to be digested by kids so things like overarching plots, foreshadowing, motifs, it's all there but in really small doses that kids just starting to think about these things will be able to pick up on.
Now, where does this all tie in? Simple.
They spend so much time and effort invested in these things that are ultimately unrewarding (you can't "get" anything out of analzying the story to Sonic or MLP. And it's consumable media, as in you aren't putting in any real effort to enjoy it. And before anyone cries foul at me because Sonic had the Genesis games, fuck you go play Alien Soldier and then tell me Sonic is engaging).
And it's like you said, it's "on a plate for them to grab." But the difference is that with these, they've attained an almost approval through the creators using very similar character designs.
It's not the creators fault really, using simplistic designs means things are going to be simplistic. But it also means it's piss easy for unimaginative autists to just smash things together or recolor things.
Remember Sonic recolors?
It never stopped, it just changed what was being recolored. How many things have an MLP version? That only happened because the character designs are prop swaps.
What I'm getting at is that if you make something with bright colorful characters simple enough and with enough that one of those flash character creators can be made of your work, you're going to attract turbo autism.
Don't believe me? Think of any example like this and then look how many Donut Steels there are.