This reads a bit like an alarmist scare. The only real complaint the author has, despite linking it several times, is that SMS is hackable. This is true to some extent, as SIM cloning isn't a straight forward hack and is largely based on social engineering. Still it doesn't really matter for two reasons.<p>First, common attackers are opportunistic and they are unlikely to know your phone number. Even if they did, it would take skill and effort to clone your SIM. For this to happen you need to be targeted as an individual and that's a different scenario from random PayPal attacks.<p>Second, PayPal aren't stupid, and they have to be aware of SIM cloning. They also have data that we don't. Looking at their data and the probability of an attacker carrying out SIM cloning, they must have decided the cost of probable cases is acceptable if and when these attacks take place. Or that it's fairly rare to actually happen.<p>Besides, this option isn't available to all users, so there might be more going on than we realize.<p>I understand the author is upset that they can't set a single TFA channel to be used exclusively. But I think the real gripe here is that the author feels loss of control rather than a massive security issue.