Actually it was scary easy just to email the services and ask them to remove 2 factor auth so I could login and re-enable. (CampBx, Coinbase, etc)
How they know you are not hacker ? !!!!
Don't you know that your email address is the keys to the kingdom in almost all security policies?
Don't you know how to write an email with any sender address ?
Yes. There are obvious problems with using email as the end game of security, but the reality is that is how it works. Plus, I would assume they would only accept requests from the address on the account. (yes it can be spoofed instead of just blank)
Just 3 steps
1. accessing router where unencrypted mail will routed
2. click [Reset password] on exchange (now you know password)
3. send an email "Please remove Google auth."
:-)