That sounds like the Blue Frog model from 10-15 years ago where IIRC each spam email would trigger one “please opt me out” request from everyone on the user bas

That sounds like the Blue Frog model from 10-15 years ago where IIRC each spam email would trigger one “please opt me out” request from everyone on the user base. Then the spammers started trying to DDOS them back. https://en.wikipedia.org/wiki/Blue_Frog https://en.wikipedia.org/wiki/Blue_Frog