The time has come for a European University CSE department group to reverse-engineer HDMI 2.1 and publish a compatible implementation on Github.
There's a solid history of this category of work going back 30 years.
They have certain legal protections for compatibility and public interest work.
This 1990's licensing model is antiquated and obsolete.
IEEE and ITU have abdicated their responsibility so sombody like Valve needs to do for transport spec what AV1 did for codecs and linux did for operating systems.
"A rising tide lifts all boats" is common among free marketeers and communists but opposed by fascists.