That one’s especially egregious because the Direct Rendering Manager handles displaying things to the screen, where you might have Digital Rights Management involvement in the form of HDCP support, etc.

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I agree, but the wording of that is imprecise…

Google reimplemented the same API (which should be legal) but “use” sounds like they called Oracle’s implementation of the function

Oracle tried to argue that writing your own virtual machine with the exact same same interface as theirs (even a clean room reimplementatio, or an improved version) was copyright infringement

If Oracle had won, it would likely have killed things like OpenJDK, WINE, Proton, Rosetta, etc. and would have made licensing around OpenGL/Vulkan very confusing (for a few examples)