Not necessarily, you can use steam on a Mac and it runs natively, you can also use it with parallels with virtualized windows, or you could've owned a PC and ac

Not necessarily, you can use steam on a Mac and it runs natively, you can also use it with parallels with virtualized windows, or you could've owned a PC and accumulated steam games at one point in your life and then moved over to the mac ecosphere. There are plenty of use cases where you may have a steam library and not have a PC... you're just not looking very hard.