> It seems all the folks who “have it on good authority” that this is a dangerous propaganda tool, can’t share what “it” is.

No need to speculate too hard here, there are plenty of examples of censorship on TikTok: https://en.wikipedia.org/wiki/Censorship_by_TikTok

Censorship is a form of propaganda, and even the very obvious/reported examples we've seen reported over the years are pretty bad. And you have to assume that there is more going on than is actually reported/noticed, especially in subtler ways. It's also just obvious it's happening in the sense that the Chinese government has ultimate control over TikTok.

I tried to find a "Censorship by Youtube" wiki but couldn't find one. Only one documenting the censorship OF youtube https://en.wikipedia.org/wiki/Censorship_of_YouTube.

I don't see a section on their main wiki either, even though YT is pretty notorious for deleting stuff, even political stuff https://en.wikipedia.org/wiki/YouTube