As many of you probably have heard in the last few days
HDMI Forum to AMD: No, you can’t make an open source HDMI 2.1 driver
The reason for this development is crystal clear. The most widespread display connector in the world is at war with open source. HDMI 2.1 is the standard needed for using 4k and high fps simultaneously. Its only competitor being display port.
But is DP really a competitor? It's not like you can choose since all devices are on HDMI-only. Your USB-C cables use hdmi internally too. There are no TVs with Display Port. Basically only desktop computers sometimes use DP.
Most egregious of all is why this is happening: HDMI literally created for adding DRM to Cables. It's about piracy. And almost all hardware manufacturers are collaborators. HDMI capture cards do exists. But they're already cracking down on it. They don't want you to own any media.