Ok, it's great that you want that, Apple clearly doesn't want to provide that for you any more than they want to provide you with Intel based macs, watches that run Linux, or touch screen laptops. No one has explained yet why Apple should be legally obligated to provide that for you. There's a lot of hand waving towards Apple having a monopoly on their own products, which is something of a tautology, but notably no one claims they have a smart phone monopoly or a smart phone OS monopoly because that's patently absurd given the sheer magnitude of the non-iphone smartphone market. Nor has anyone explained why they're not satisfied with getting those things from that non-iphone market.
This isn't like the late 90's computer era. Apple doesn't fine BestBuy and AT&T for carrying non-apple smart phones. They don't obligate Samsung and Sony to buy licenses to iOS for every phone they ship, regardless of whether iOS is installed on it. Heck, even though they're bundling the web browser with the OS you can't even reasonably make the argument doing so is giving them a monopoly in the web browser space.
I want Apple hardware, iOS, sideloading and custom browsers with plugins.