My mom got locked out of her 10yr gmail account. She doesn't have access to the phone number she added for 2FA. This is after she has the right password and also has access to the recovery email.
This basically locked her out of her whole online life because for all other social accounts she uses sign in with Google.
There is no human support, and their support website says if you cannot recover the account, create a new one.
Once you are the dominant provider of something that is nearing life-essential utility status, you should provide support and escalation routes, and you should be accountable.