There's not much of a point in overly restricting the windows OS.

End users who don't want to pay for it anyone are just going to find a workaround.

It's the OEMs and corporate users where Microsoft makes their money, and who also lucrative targets for legal action if they are using it unlicensed

It's a similar strategy to how Adobe has protected their creative suite products: they rather have college students and personal enthusiasts familiar with that particular software than fight tooth and nail enforcing licensing on the average person.