BluRay DRM is the worst thing ever - it demands that you are FULLY locked out of your own computer (this is why 4K HDR BR players are practically non-existent for PCs, since you need a fully locked out DRM stack from the drive to the display), it and demands internet connectivity to download keys. The number of devices that actually conform to draconian BluRay 4K spec is order of magnitude lower than devices that can play Netflix content.
DVD and Blu-ray both have DRM, though. I guess there's always VHS.
DRM is not undefeatable.
The problem isn’t defeatability. It’s the principle of buying DRM-locked content.
It’s a compromise I’m willing to make under certain circumstances, but ultimately one that bothers me.