The only difference between a paid and unpaid piece of software is the revenue stream. In a paid software, your incentive to not screw over existing users is be

The only difference between a paid and unpaid piece of software is the revenue stream. In a paid software, your incentive to not screw over existing users is because your app would get poorer ratings and you won't acquire new paying customers. I've seen many times where a paid app stops growing as much and turns into a subscription model or becomes unpaid, giving paid users some small benefit (or nothing at all) and starts screwing over all users indiscriminately.