Video hosting/streaming is the hardest use-case to replace due to infrastructure costs. PeerTube exists, which works like torrents and is probably the best solution that we’re gonna get for this. I don’t see it replacing YouTube though, since decentralization fundamentally limits reach (and potential income as a result) and a lack of data collection makes it harder to accurately profile viewers (both of which professional content creators care about). It’s probably fine for hobbyists and FOSS projects that want to distribute videos though.
Privacy as a cause is something that helps support other forms of activism. We live in a world in which hostile state actors routinely surveil activists in order to more effectively divide, subvert, marginalize, and intimidate them; privacy is important counterplay against this. It’s like saying that you’re not going to eat healthy because exercising is more important; one facilitates the other.