It cost me ~$600 in app purchases to switch from Android to Apple. So “just buy a different OS if you don’t like it” is not a reasonable solution unless you only have free software and it is also free on your target OS. The fact that these licenses can’t be transferred is part of the problem (though I’m not sure that is even addressed in this legislation).

You don’t personally have to benefit from this legislation, you can stay in an “official” configuration until the day you die. For some of us, this opens the door to have a FOSS App Store, or custom apps without having to rebuild them once a week.