I don't buy that explaination. Several of us are getting the same sort of intrusive shock content; are we all using the same VPN endpoint? Doubtlessly not. Furthermore, I've seen no other kinds of videos that would suggest recommendations bleeding through from other viewers; particularly youtube never suggests any sports content to me. Sports are extremely popular so if recommendations bleed through IPs, I should be getting lots of sports content. I get none, youtube's suggestions are almost perfectly tailored to me with the sole exception of these occasional shock videos.