I think it is because Windows has many subsystems, it’s just that you don’t hear about most of them aside from WSL.

So it is referring to the particular Windows Subsystem (of which there are many) that can run or emulate Linux.

Uh, how? I mean you’d need to make it legal I feel like. But that’s never going to happen and I honestly don’t think that’s fair either. If piracy is legal, how would content creators actually be paid?

I get the sentiment but this is not really an option most of the time if you want to stick with lawful methods. For instance, I cannot watch most movies or TV series these days without a subscription to some service.

This is a legacy from the past of typewriters. Please never do this.