This is BS because the owner can create their own keys, disable secure boot, etc. so they can't be shut out of their machine against their will, that is not a real thing. Now if you start talking about boot locked machines that might be a different story but we definitely are not talking about that, even MS wants to make sure x86 hosts aren't boot locked (only their ARM tablets, like many Android devices).
In any event this is a feature that can be used for the good of the system by the system owner and that is what Linux will use it for.
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