Good points. Darn, I wasn't aware things were so messed up on Newgrounds. :( I lurk there regularly, but hadn't noticed the purge until now.
Guess I've just been lucky, since most of Mittsies's and Rockcandy's stuff and, like, all of Gorepete's and Creambee's flash games are still up (for now). You're absolutely right, though: looks like the mods removed HTH a few years ago, and a bunch of other classics. I knew that cutesy, chibi-looking characters were a grey area there, but this is something else.
Yeah, itch has an okay track record for moderation compared to some other sites. But I have seen stuff removed here that wasn't violating any obvious rule. I guess it is what it is.
Wish ya the best! :3