Earlier quoted context omitted.
I always wondered how is it stealing if you (1) own a copy and, (2) Apple effectively stopped charging money for macOS.
I think that the illegal (ish) part comes from Apple making macOS free if you're installing it on Apple hardware. They don't publicly license it for use on non-Apple hardware, although, I would guess that VMWare if not others has a license to run it on random x64 servers to test ESXi with because setting up a different testing environment of Mac Minis to test every change to their hypervisor on instead of using their…
I don't think it's true since the phrase in question was present also in Mac OS X when we had to purchase each version. Apart from that, this part of the license is not valid in several European countries. When you think of it, it's quite reasonable: how could anyone dictate how you are using something you purchased? It makes no any sense.