Because the HDMI forum is ass?

That’s the problem. Open source software doesn’t work with the NDA. Nvidia does it with an embedded processor and closed firmware, Intel does it with an embedded Displayport to HDMI converter, AMD does it in the driver. Steam uses AMD chips and open source drivers so they can’t get it to work.

Fabs take like 5 years to spin up. No one is going to set up another without some kind of guarantee