Comment by higherpurpose

Is that method of sending the Authy authentication code any more secure than all the "regular" SMS-based 2FA methods (like say Gmail's SMS-based 2FA)? If so, how?

I think Google's (or Microsoft's because I think they use a similar SMS-based 2FA) method could be easily manipulated by intelligence agencies for example with access to the carriers' networks. The Google Authenticator app is now completely useless for Gmail as well, since they made it to fallback to SMS-based 2FA if you forgot your password (ugh - why Google? WHY?!).