I don't use Tiktok but I gather that this is a big problem over there as well, so it sounds like Twitter is working just as well as the site it's riffing off.
I don't either but my understanding from other feedback, and from the article linked, is that no, it's not a problem there. More accurate algorithm and proper moderation.
It is, because my wife is an avid Tok user and complains about it, and reports it, frequently. She also says there are many animal videos that are "unsettling" but not outright abuse.