Spying, backdoors, reporting keystrokes, telemetry, browsing habits et -al are amongst other major issues.
They all do it mate.
Anybody who thinks their data/privacy is safe with any corporate provider, be it MS, Apple, or Google is kidding themselves.
That battle was lost the moment Adam Smith started writing so eloquently yet amorally about how our economies/societies should work (the Russians and Chinese lost it again in a different way, when they allowed zealots and power hungry evil men to take control of their societies).
I've used a few Linux distros back in the day and liked them. Cleaner, faster, and once you'd got a Linux mindset, not particularly more complex to configure and use. For a while I ran a dual boot with Windows only used for gaming and flight sim usage.
Honestly though, these days I just don't have the energy to concern myself with the remaining clunkiness (which isn't much nowadays, I'll grant) of a Linux distro. My PC is a tool and frankly after nearly 30 years of being a reasonably good/competent programmer, I'm pretty bored with computing generally.
I happily run a Win11 install with Edge as my usual browser (yeah, yeah, I'll give Brave a go sometime if I can be arsed) and Word and Excel for office-y type stuff and FreeCAD and Solidworks Maker Ed. (both of which I'm staggering around in like a drunkard on a trampoline but am making progress with) for CAD.
I have an android phone and have done since the early days of smartphones, these days, I buy my daughter or son in law's cast offs as that means I get a phone one or maybe two gens out of date.
My biggest problem with Apple is their hypocritical positioning of themselves as some kind of cool, more kindly, less corporate entity. It's BS and it irritates me intensely.
Sure, MS and Google don't use adverts that say "Hey! We're corporate capitalist bastards and don't give a tuppenny crap about anything but the bottom line" but Apple's marketing has been for a long time so mendacious and slimy that come the revolution, higher up execs in MS and Google will have to wait for me to get finished with a pair of pliers and a blow torch and the Apple board, before it's their turn! (I'm absolutely joking by the way, violence begets hatred and more violence, and no revolution that was achieved through immoral means ever worked out well!).
Brand loyalty is crazy and should be anathema to anybody working in any rational engineering pursuit. We should be concerned with the behaviour of products, (i.e. does given product enable/help me to perform my task efficiently such that the products usage is transparent; bonus points can be had for aesthetics but these do not override functionality of course).
Brand
aversion is less crazy, just as long as it's based on sufficient knowledge of the current product set and/or the behaviour of the company vis-a-vis our personal principles.