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I don’t believe the ISP would have legal standing to take you to court, as they don’t hold the copyright.
They’re in the middle, being told hy copyright holders that someone using their service is violating copyright, and they must “do something”.
Eventually they may shut off your service, but I haven’t heard of it happening since the early 2000’s.
I’m sure they will. It’s always a cat-and-mouse game.
It’s been a while since I read about DRM, but what I recall the challenge is not being able to control end-to-end, which is what really drives trusted boot efforts in both Android and Windows.
If you don’t control the hardware and OS, then someone can use it to sidestep DRM.