Invidious is a YouTube frontend. This instance is the only one still working after Google went on the offensive.

Nebula is a paid platform that is run by the creators who use it. Loads of intellectual fibre and original content.

Floatplane (also paid) is a Patreon-esque platform owned by Linus Media Group (who also manage Linus Tech Tips). I only used it to watch DankPods, though.