I had a few alt accounts, they were all banned and I wasn’t able to make a new account with existing emails.
I assume, with no evidence, that they just used the same data tracking for ads, to enforce the ban. I think Meta turned on the real banning tech during a panic in Covid iirc
I noticed I was shadow banned on youtube (for comments). I have no idea what was the reason because I rarely comment and am very civil when I do. It doesn’t bother me much though, I was just curious how it happened.