Basically, there should be a video indexing/search/discovery protocol (don't care if it's still http) where random people can submit metadata and a link to a distributed content-addressable system like ipfs. Alternatives to youtube,tiktok,etc.. even platforms like Bluesky can make use of this. Popular videos get more "seeds"/"mirrors" this way. The biggest problem is getting enough interesting content, so the browser extension helps with that, you just click "share in <insert platform name>" and you have it locally available as well as available on any of your other devices, and now others can see the content without having to use yt.