Why is Apple selling MacOS if it's already free on Macs and can't be installed on PCs?

Question

macOS

Hello! Recently I came across that you can buy MacOS on the official apple website: https://www.apple.com/shop/product/D6377Z/A/os-xm...
And now I'm completely confused: You can't officially install MacOS on a PC , Hackintosh only, and updates are free for Macbooks, so why are they serving this?

Answer 1

This is an old OS of those times when they were still given for money. MacOS became free not so long ago.

Answer 2

and for macbooks updates are free, so why are they serving this?

This is not an update at all.

Answer 3

Plus there is such a thing as "physical media". For example, you can buy a disc from Microsoft separately (without a license) and a separate key (sticker, certificate, license). So Apple can also make a little money on a "physical medium".

Answer 4

That's right, systems up to Mountain Lion were sold (and are being sold) for money. They've been free since Mavericks.