Bitchute seems to be gaining traction. Currently, they're where you go to watch banned videos and banned content producers like Infowars, Soph, etc.
PeerTube is one alternative that is recommended.
Does PeerTube have an answer to the discoverability problem yet? That's one thing I've noticed in the past.
It works if you have a specific URL to click on for a video, but if I just want to "find" a video, that will be relatively difficult.
Twitch.tv! It's not just for live streams either. You can watch lots of previously recorded streams as well. It's also not just for video games (though it is predominantly video games).
I can't think of a decent alternative, for learning khan academy is good. Sounds like a source for disruption :)