@dansup Anti-spam for email works in a similar way--abusive hosts are reported to and listed by a variety of different providers, and each independent email host has the ability to refer to whichever lists it trusts. We can already see something similar shaping up for fedi in the form of Oliphant's lists, Ro's TheBadPlace, and such. Having lists that break down block reasons (i.e. spam, harrassment, scraping, etc) is probably the next step. Get ten of those running and we're good to go lol.