Encrypted monitors can be countered by a high quality video camera mounted on a tripod behind your chair or on a wall or ceiling

Expensive, yes, but at that point you're already spending real money on a second computer with a GPU to do computer vision on the game video stream, so...

HDFury devices allow stripping of HDCP 2.2, and vast majority of users currently don't have HDCP 2.3 compatible monitors/TVs, so that's not an option yet.