[Marsymars]

I got locked out of some old gmail accounts in a similar way - they were created without phone numbers and while I have the passwords, I get flagged for suspicious activity when I try to log in, and there's no actionable recovery flow.

[parable]

If there's no recovery email address set, or that email has expired, there are no recovery methods to verify with. The account is locked "for good". I use quotes because in some cases I've been able to recover Gmail accounts with similar characteristics by simply trying often on my home IP address using Google Chrome.