You probably saw something which said the key can’t be remapped, which is likely to be true but only because windows won’t let you, rather than being any kind of technical problem

That’s nonsense. To do what it does, it sends a signal to the operating system. It’s entirely within the operating system’s power to do something different when it gets that signal

Oh, absolutely. It’s not something which should be encouraged, and against a well designed modern system it probably isn’t possible (there must be some challenge-response type NFC systems on the market).

I’m just saying it isn’t unambiguously “illegitimate”

That’s probably debatable, if they have permission. They probably shouldn’t have been given permission, but that’s a separate issue