This is the reason we need alternatives to iOS and Android - to allow real customer-centric mobile OS where users aren't held hostage. Would it be a big problem

This is the reason we need alternatives to iOS and Android - to allow real customer-centric mobile OS where users aren't held hostage. Would it be a big problem for OS manufacturers to add more options, such as paid upgrade that could retain access to previous version's settings instead of being completely sandboxed from it? Of course not. Would it be a problem to offer a year-long automatic upgrades while retaining the last version once payment runs off, instead of blocking access? Of course not. It's just greed, the need to have "predictable income" and to stuff it to the user that allows this to happen. Instead of trying out and buying an app as a one-off if I like it, I am not going to even look at a non-essential app that requires a subscription.