Seeing that 80%+ of iOS users update to the latest OS within the first 3 months according to Apple’s charts, why would you think that if Android users could update they wouldn’t?
I think there'd be a veritable shitstorm if, say, AT&T suddenly decided to withhold iOS 13 for 6-12 months, while it's effectively SOP for Android devices (where you have manufacturers needing months to release a new version, then providers who delay it even further to test ... something).