It does take time and effort to find the new one though, and if that isn't enough to dissuade continued piracy, there are plenty of impostors that always arise

It does take time and effort to find the new one though, and if that isn't enough to dissuade continued piracy, there are plenty of impostors that always arise serving fake files and real malware that act as a follow-on deterrent. Nothing's going to stop a teenager with no income and unlimited time from seeking out the new iteration, but when it's easy and obvious enough for my tech-illiterate and impatient mother-in-law to pirate movies, any action taken to rock the boat (domain seizures, C&Ds to subscribers, etc.) does have an impact.