You can see how Google rolls with how they deleted old Gmail accounts - years of notice, lots of warnings, etc. They finally started deletions recently, and I haven't heard a whimper from anyone (yet).
Dropbox seem to be doing the same thing. After years of whining about my 2TB above limit I recently received a mail with a deadline to delete my files or they will.
The problem is that some content creators have already passed away (and others will pass away by then), and their videos will likely be deleted forever.