Maybe because their account was deleted.
Why are some peoples accounts...

I think you can request it. Accounts are also deleted if someone's broken the Terms of Service. It used to display a more specific message (i.e. "This account was closed for suspected cheating"), but now it gives the same message for all of them.

2 things.
1/ A member decided to close their own account.
2/ They broke site rules, thus we (staff) closed their account.

2 things.
1/ A member decided to close their own account.
2/ They broke site rules, thus we (staff) closed their account.
For example, this user's account was closed for impersonation of chess.com staff, which is against site rules.
- chess.com staff

They don't get banned if they cuss. People all aound Chess.com cuss everywhere. Just pass it as spam.

Are you allowed to improsate mods?
regards, mod
no, you are not allowed to impregnate mods. If that's what u meant.

Are you allowed to improsate mods?
regards, mod
no, you are not allowed to impregnate mods. If that's what u meant.
oh no! I have impresnated mod a number of times on tactics puzzes!
Why are some peoples accounts gone??