“The tools to bypass the strictest protection are made available through private channels and for a few days, they’ve been floating around in public as well.”
Widevine L1 is the DRM that’s supposed to stop 4K rips. Scripts that defeat it already circulate privately, and for a few days they sat on GitHub. 4K leaks show up anyway. DRM doesn’t stop the pirates. It stops the paying customer from watching on the device they prefer.