For a lot of things I already had changed to alternative sites, the best alternative to YT IMHO is Odysee, music of all kind you can listen here 24/7, or in Bandcamp, for movies there is PlutoTV and the pages of the local public TV for free, news are in the homepage of the prefered newspaper, etc..
Certainly there are also neonazis, like in all other streaming platforms too, including YT, where I already blocked some channels because of this. Worst is removedute respect nazies.
Idk, Maybe instead of avoiding nazi spaces, people should take a page from their book and just invade them and overwhelm them. Idk about you, I have to put up with hearing and seeing bullshit daily, so my tolerance is high. A lot of these fascist can't even handle a picture of a catboy lol