You may argue that the relevant market is for "computers" as a whole, however it can be argued that bundling hardware and software to charge high prices is a classic monopoly behavior nonetheless.
Saying Apple has a "macOS hardware" monopoly is like saying Dyson has a "Dyson motor monopoly"
Companies get to choose what their products are, full stop
Microsoft was forced to unbundle IE, so why would this not be possible?
But... funny you brought up Tesla, because Tesla also had this exact problem! Tesla had the supercharging network, which they own and manufacture. But superchargers aren't just a product, they're a platform.
Tesla had a monopoly on superchargers, until they pre-emptively opened up the network and open sourced the connector. If they hadn't, IMO it was extremely likely they would've been forced, eventually.
I also have some information about the wetness of water.