The thing I need that I currently use YouTube for is a place where I can store long, large videos (think around 2 hours). I want to be able to link to these videos, and disallow anyone who doesn’t have the link from seeing them. I have a lot of personal videos at this length and at a much shorter length that I want to be able to keep saved both for myself and to be able to share with various friends and acquaintances. YouTube has filled this need and still does, but I’m looking to move off of it. I’ve looked at some alternatives and few of them worked out for me because they don’t support long/large enough videos.
If you want privacy and control over who sees your stuff, I’d look into storage platforms that support live video playback, rather than video platforms. And if you have a LOT of videos, you’ll likely end up paying a small amount per month.
If you’re sharing videos that don’t have any copyright concerns or issues, then something like Google Drive, Dropbox, or Box should work.
If you want something FOSS, I’d say you’re limited to self-hosting with something like NextCloud, OwnCloud, or SeaFile. A more plug-and-play (but not FOSS) self-hosting option would be a Synology NAS.