Linux mitigates this ;)

Would it be as simple as spoofing the EDID manufacturer/product to something generic? I naively assume DCC/CI would all still work?

There's this:

https://goldilocklabs.com/products/silentglass

And this:

https://git.cuvoodoo.info/kingkevin/board/src/branch/hdmi_fi...

But I'm not sure they would block it, and the latter is not plug-and-play.

I expect it wouldn't be especially hard to make one though.