You have both the right and possibility to install whatever software you want on an iPhone and Apple can’t stop you. Many tinkeres play around with this. But that’s not what your actually talking about, you feel that Apple should be forced to make that easy and to support it to the point where it’s as easy as staying in their managed ecosystem, which is something entirely different.

It’s like people complaining that you can’t change the battery in a iPhone and saying that it infringes on their rights, but of cause you can actually replace it, it’s just difficult, not impossible. But Apple will void warranty on diy repairs, but is that really such a bad thing? Why should they psi if I screw up my repair of the product?