ISPs, CDNs, domain registrars, DNS, etc. have all cut off services to sites that they consider in violation of their user agreements (which mostly boil down to you've become a liability for us). If you've annoyed enough people, you can pretty much get booted off the Internet--especially if you need enough infrastructure, data, authentication, etc. that you can't easily just force people into a game of whack-a-mole.