Any security feature that can be totally defeated with a spicy HDMI splitter and a 2nd computer should not exist. This stuff looks much more to me like "fuck the user" than anything else. I am 100% convinced there is a cult of evil bastards at Microsoft, et. al. that is hellbent on making everyone's UI/UX as janky as possible.
It is essentially like a watermark in a PDF. It can be trivially defeated, but that isn't the point.