Ostensibly is doing a lot of work here because it literally does not. I can torrent any show or movie that is otherwise being streamed with DRM. DRM is a complete farce that serves no actual purpose but to make idiotic media executives happy.
You might be able to torrent any show or movie in high quality with a private tracker, but it's hard to come by 4K HDR content just hanging out for free these days.
Even if that's the case, that's not an issue of DRM, that's an issue of distribution.
It's also just flat out not true. Sure, some of the 4k HDR content might originate from PTP/BTN/scene/w.e., but it's readily available on e.g. RARBG.