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Are you somehow under the impression that Android devices aren't hacked as well?

Of course Android phones are hacked as well

But a hack on my Andriod device might, or might not, work on your Android device

Not so much iPhones. Some difference between versions, but pretty much a monoculture

Pegasus exploited both iOS and Android, not just iOS.

Closed source doesn't imply security through obscurity. Any operating system, closed or open, can be vulnerable. iOS is a big, relevant target, and obviously a lack of publicity/quantity of commercial exploits against AOSP and Desktop Linux doesn't necessarily mean good security.