Uh, Android is the alternative to Apple’s iOS. That’s your alternative. Android is much more customizable.
Azure don’t give a shit what it runs. Windows is on its own these days; if they succeed, good for them, but honestly I think the days of Microsoft just pretending to give a shit about Linux are long gone; it’s an important OS to them too.
I’ve worked for Microsoft for 12 years, still have lots of friends there so I get some of the vibe from that.
While Microsoft and Google merely pretend to like open source but transparently hate it, it is (was) not quite as obvious that red hat wanted to capture the enterprise Linux market wholesale. What red hat has done is terrible for the ecosystem, much more so than Microsoft just throwing out worthless tokens of appreciation.