Usually the protection against such spam is social shame but the internet is now full of people who have no shame because shame was never part of their culture. It would be more effective to use GeoIP in this case.
Internet reputation became easy to launder, thus meaningless.
It’s not just the Internet. It’s politicians and businesspeople and more generally, shameless citizens.
There’s a lot to dislike about shame as an enforcement mechanism but I’m starting to miss some of the upside it delivered.