You can strip HDCP from HDMI 2.2 [0] and then just capture that stream. Very easy to do. Anything that can be seen on your screen can be captured and shared.
0. https://www.amazon.com/HDMI-Splitter-Supports-Pass-through-D...
0. https://www.amazon.com/HDMI-Splitter-Supports-Pass-through-D...
>-Support HDR & HDCP 2.2 Pass-through
Which is not stripping away anything.
Those who remember the old analogue "video stabilisers" used for stripping Macrovision copy protection signals will find this similar.
[1] https://www.wired.com/2010/07/apple-approves-pulls-flashligh...