If the day comes where it’s impossible to at the very least, clean off spyware stuff you don’t want, or install custom ROMs if necessary, then I’ll stick to older units that have the ability still. And if that ever becomes impossible, then stop using a smartphone.
And all the arguments in the world about how everything requires a smartphone - I don’t care about. That cannot be literally required, at least not for anything important because it’s not possible to assume/ensure that every person has one and that it is fully operational etc.
If this creates a nuisance for providers of various services, so be it - in fact, all the better because they can potentially be a source of pressure to maintain the availability of customizable devices. But that’s a very very miniscule likelihood; more likely is that they say well, too bad, if you don’t have a smartphone then this hospital can’t treat you. There may come a point where it literally will be impossible to functionally integrate in society without being spied upon 24/7. And in America at least, this will be welcomed with open arms because - well, you know: sheep.
But even then, there will develop a bigger and bigger fringe subculture of off-the-grid individuals who still value the concept of privacy.
So - like every sci-fi dystopia depicted in film and literature throughout history. Well, anyone who complains won’t be able to claim they weren’t warned a million times literally.