Don't waste your time with this.
If you decide to use them, do not use the same password as your email or any other site.
when i try to sign up, the registration form didn't ask me for the password. if do, i never use the same password.
i just heard about HONOR who steal few account at BTT with a form to claim they distribution and also they trying to steal the account in exchanger. and some of BTT user who use the same username and password in exchanger been hacked.