The best way to prevent a SIM swap is to not let your phone number be used as a trusted piece of authentication. Sure, what this guy did was criminal. But not

The best way to prevent a SIM swap is to not let your phone number be used as a trusted piece of authentication. Sure, what this guy did was criminal. But not nearly as criminal as it should be for companies to unilaterally force customers into using snake oil authentication methods, just so they can check some new compliance boxes and pretend to be adding security.