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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
This is a most excellent place for technology news and articles.
Likely moreso that they're facing pressure from other competitors in the industry that see Steam and open source in general as a threat to their business model. The HDMI forum is made up of industry leaders, and naturally Microsoft and Sony are there.
https://hdmiforum.org/members/
They've been refusing open HDMI 2.1 since 2017. I don't think that being afraid of Linux becoming the dominant gaming platform plays a role here; it's more likely that they're afraid people might find new ways to get at protected content.
Isn't getting at protected content pretty trivial anyway? At least that’s my impression from how easy it is to find basically anything.