There's also a long history of people abusing the fact that DMCA notices essentially require the provider to not verify anything—filing fake reports for various

There's also a long history of people abusing the fact that DMCA notices essentially require the provider to not verify anything—filing fake reports for various motivations that can't be readily traced. Given that both have a history here, the big question is who benefits. I can think of a very likely motive for an internet vigilante to try to smear United Healthcare by making them look even worse. I can't think of a great motive for United Healthcare to try (and completely predictably fail) to suppress the story.