Sure, everything that has a backdoor is bad. But what does that have to do with SMS 2FA?
Surely SMS 2FA (without a backdoor) is better than nothing. Sites should still offer something better than SMS for 2FA as it has widely documented issues. But as an end user presented with SMS 2FA or no 2FA; SMS 2FA is the safer option.
Is there a reason to assume an arbitrary SMS 2FA implementation would have a back door? That would be news to me.
Surely SMS 2FA (without a backdoor) is better than nothing. Sites should still offer something better than SMS for 2FA as it has widely documented issues. But as an end user presented with SMS 2FA or no 2FA; SMS 2FA is the safer option.
Is there a reason to assume an arbitrary SMS 2FA implementation would have a back door? That would be news to me.