I’m 100% against going back to modern Android. I’ll ditch technology before that happens. I’m certainly also removing my entire library from iCloud, and won’t update to iOS 15 for as long as I possibly can. I also foresee the day when an update comes along so that the phones will scan and report images without iCloud. It wouldn’t be the first time a controversial feature was rolled out in two stages.
When contact tracing was first announced, many people justified it by saying that it was only an API and other apps had to be built to use them, entirely missing the sentence that eventually it would be a fully functional system on its own. And when folks like me pointed that out, we were dismissed by people apologetic to Apple. Well, iOS 13.7 came and went, which enabled full functionality without an app, so now it only takes an update to switch that on without the user knowing, whereas before one had to manually download a government app to make it work. Buying the iPhone 12 is what forced me into iOS 14 as my iPhone X made it nearly impossible to talk to people with the garbage mic software on it.
Either the hardware will force you to new software or say a banking app will require the update. Anyway, hard to think of alternatives. The whole thing is still not even fully live yet so let’s wait and see.