How exactly does that prevent spam, vs just using other existing established verification methods like email validation? If the only goal is preventing spam, its overkill, and other web sites who also have to contend with spam don’t use it.
It’s trivial to create new accounts and emails to verify those accounts. It is not trivial to get a new phone number since virtual numbers are blocked by the verification process.
It’s trivial to create new accounts and emails to verify those accounts. It is not trivial to get a new phone number since virtual numbers are blocked by the verification process.