Sadly, probably something like TPMs or email logins (from a reputable email provider of course, one who requires SMS to sign up, from a reputable phone provider

Sadly, probably something like TPMs or email logins (from a reputable email provider of course, one who requires SMS to sign up, from a reputable phone provider of course, one who doesn't offer free VoIP numbers and requires a credit card to sign up, from a reputable card brand of course, not a burner card)