YT (Big G's vid-sharing platform) is privating old vids that you "unlist" if you don't opt out https://blog.youtube/news-and-events/update-youtube-unlisted-links/
Mastodon is a "FOSS" social sharing hub. A multi-host substitution for capitalistic platforms, it avoids risking a particular company monopolizing your communication. Pick a host that you trust — you can still talk with all hosts running Mastadon. Any individual can run a Mastodon instantiation and join in this social hub in a jiffy.