Other app stores that are approved by Apple while giving Apple a cut after a million downloads of an app.

You still can’t install whatever .ipa file you want on iOS, even in Europe. So if you want something like Revanced (uYou+ on iOS), then you have to go through the whole rigamarole of creating an Apple developer account, resigning the ipa file, and repeating the resigning process every week, optionally using something like AltStore to automate that process, or alternatively, jailbreak, which means that you have to stay on an old, exploitable iOS version and never update.

What really needs to happen is that the consumer needs to own the device they bought. What this means in the smartphone world (also other devices, like video game consoles, car computers, smartwatches, smart TVs, tablets, laptops, etc.) is a few things: root access, an unlockable bootloader, and replacable signing keys for the primary bootloader while providing a firmware package to go back to 100% stock (so no Samsung Knox that irrevocably triggers after unlocking the bootloader or DRM keys that get irrevocably wiped when unlocking the bootloader) (all of these being optional features that the user has to explicitly enable). Anything short of that is not ownership.