Youtube already employs DRM on some of their videos (notably their free* commercial movies). if you try to take a screenshot, the frame is blacked out. this can be bypassed by applying a CSS blur effect of 0 pixels, permitting extraction; detection of DRM protection and applying the bypass is likely trivial for the kinds of people already writing scripts and programs utilizing yt-dlp. the css method of bypass has been widely disseminated for years (over a decade?), but programmers love puzzles, so a sequel to current DRM implementation seems justified. YT could also substantially annoy me by expiring their login cookies more frequently; I think I have to pull them from my workstation every month or two as-is? at some point, they could introduce enough fragility to my scripts where it's such a bother to maintain that I won't bother downloading/watching the 1-3 videos per day I am today -- but otoh, I've been working on a wasm/Rust mp4 demuxer and from-scratch WebGL2 renderer for video and I'm kind of attached to seeing it through (I've had project shelved for ~3 weeks after getting stuck on a video seek issue), so I might be willing to put a lot of effort into getting the videos as a point of personal pride.
the real pain in the butt in my present is Patreon because I can't be arsed to write something separate for it. as-is, I subscribe to people on Patreon and then never bother watching any of the exclusive content because it's too much work. some solutions like Ghost (providing an API for donor content access) get part of the way to a solution, but they are not themselves a video host, and I've never seen anyone use it.
> this can be bypassed by applying a CSS blur effect of 0 pixels, permitting extraction
That's not real DRM then. The real DRM is sending the content such that it flows down the protected media path (https://en.wikipedia.org/wiki/Protected_Media_Path) or equivalent. Userspace never sees decrypted plaintext content. The programmable part of the GPU never seen plaintext decrypted content. Applying some no-op blur filter would be pointless since anything doing the blur couldn't see the pixels. It's not something you can work around with clever CSS. To compromise it, you need to do an EoP into ordinarily non-programmable scanout of the GPU or find bad cryptography or a side channel that lets you get the private key that can decode the frames. Very hard.
Is this how YT works today? Not on every platform. Could it work this way? Definitely. The only thing stopping them is fear of breaking compatibility with a long tail of legacy devices.
the real pain in the butt in my present is Patreon because I can't be arsed to write something separate for it. as-is, I subscribe to people on Patreon and then never bother watching any of the exclusive content because it's too much work. some solutions like Ghost (providing an API for donor content access) get part of the way to a solution, but they are not themselves a video host, and I've never seen anyone use it.