@homegrown after the fact? Sure, I'm with you and do that myself (and always temporarily close our registration as soon as we're aware of a significant wave). The point is I see a disturbing lack of nuance, when it comes to asking to get rid of the option or even preventive blocking of servers that offer it. They're not all abandoned hellholes. On the contrary.
@dnddeutsch @homegrown
Saying "people may end up blocking your server" (if you don't take care of spam) seems nuanced enough!