The HDMI Forum rejected AMD's open source HDMI 2.1 implementation

https://discuss.tchncs.de/post/11743231

The HDMI Forum rejected AMD's open source HDMI 2.1 implementation - tchncs

Sounds like hdmi Forum are a bunch of twats. Time for a new format.
DisplayPort already exists
And also USB c
USB C is just a connector, you might be referring to Displayport over USB C which is basically just the same standard with a different connector at the end. That or Thunderbolt I guess