That happened to me, lost 16 years old gmail account, which is my main account for my digital life. It happened after I disabled some tracking, and Google was no longer able to recognize me, even though I had my phone number registered, it was not enough.
I suspect this will happen to me soon, though all I do with it is occasionally sign in just to keep it registered. It now refuses to log me in unless I am on a specific IP address, no matter how many MFA steps it requests and I pass.
Same. Lost my 2004 Gmail because they silently enabled 2FA and the phone number on the account is a long lost one. I have the username/password and the recovery email is set to me. The account also forwards all emails to me, so I still get the mail, but I can't log into the account.
Not yet found someone to do a SIM swap for me and get the 2FA code...
