Anecdote (why I think it is a scam)- I had a FB account, I needed it for a previous job but didn't want it. I set up a random email address at a host I had never used, had a made-up FB name, and used a password generator for both the email address and FB accounts. My FB account had almost no activity besides viewing company posts. FB was only used from a single desktop computer. Passwords were stored in my (local only desktop) password manager.
After a couple years, FB emailed me and claimed my account was hacked. The "hacker" changed my profile picture (was a blank avatar icon) to an AI photo of a random guy. Facebook says it is hacked but they keep it visible, my two friends are still friends with the old account (they know it was hacked). FYI - I didn't care enough to send them a copy of my ID, nor did my ID match my user name, so I couldn't reclaim my account.
How would a hacker combine a random username, with a random email (has not been pwnd) only used for FB, guess a ~20 character random password, etc? And why, to steal an account with no followers and to do nothing with the account? That is a lot of work and criminal charges for nothing.
I am fine with FB saying the account was hacked and closing it. It has been years and the account is still live. Is it "active" and counted towards their users? They have a HUGE financial incentive to keep and count all accounts, and they have no oversite to verify accounts since it is all calculated internally with opaque algorithms.