I think it is reasonable for them to decide what software is available officially, in order to check for compatibility, quality, etc. However, users should be a

I think it is reasonable for them to decide what software is available officially, in order to check for compatibility, quality, etc. However, users should be allow to load software that has not been approved and to write their own software too; and the software provided officially should not be required (if it is documented, you can write your own; if it is FOSS, then you can modify it and provide modified versions of the software). This does not excuse unfair business practices though, but it does ensure that users can easily override it if they do not like some of their business practices. The number of devices is not relevant. Even on many Linux systems there is a package manager, although you can also write your own software instead of using that in the package manager if you wish, and that should also be working with Apple, etc, just as well.