Didn't Yik Yak die when they started eliminating anonymity?
In my memory they were dying before that but that might just have been my area.
Yep
I disagree. Growing up I've had plenty of positive experiences with various anonymous communities online.
I do think that giving IDs to individual messages (instead of individual people) and not having an upvote/like system will go a long way in reducing the kind of toxic behavior you have in mind though.