Bilibili certainly has copyright issues, but it's the same issue with YouTube and other millions of websites with user-uploaded pirated contents. I wouldn't say Bilibili is much worse than any other websites.
Funny I've been using Youtube for years, the only pirated content I've encountered were a few TV documenties and some unwacthable movies, and they seem to be deleted often.
Never saw Youtube promote and recommend any pirated content to me, unlike Bilibili.
Bilibili's front page is almost normal and all good, their shady stuff seems buried deep, my ipad is full of pirated Youtube videos with hundreds of thousands of views.
1. The topic on this thread is copyright, not bilibili or YouTube per se.
2. You brought up YouTube yourself.
I agree with the rest of your statements. YouTube is better than other websites in protecting copyright.