I think the problem is that of the people removed from YouTube, the vast majority are going to be removed for unsavory or misleading content, so any alternative anti-censorship sites are dominated by those people. You have the same problem with Reddit vs something like Voat.

It would be cool if these sites were able to mirror all of the youtube content as well, so you get all of youtube plus the content that people are posting to the decentralized or anti-censorship platform. Probably illegal but that's kind of the point.