You'd think that, but historically this has only encouraged niche businesses to crop up catering to that crowd. Look at Epik (or Vultr) for example, businesses that exist
solely to counter this kind of threat. Yes, they still reserve the right to remove abusive users, but that's defined by legal statutes and technical limitations rather than 'icky feelings'. Both services have a surprisingly solid track-record servicing the roughest of customers.
Failing all that, KiwiFarms doesn't need a business to stay afloat. The endgame for all of these so-called 'abusive platforms' is retreating to I2P/Tor, or another internet-adjacent network. To stop KiwiFarms from existing, you need to literally silence the people using it, not just shut down their clearnet website. Websites don't harass people, people do.