I think what the (grand)parent would argue is that this isn't removing barriers to competition, it's removing competition itself. That is, iMessage is a feature provided by Apple that makes their products more compelling as compared to their competitors. By requiring Apple to provide this feature to their competitors, they lose one of the key differentiators that make their products "better" than their competitors.
> [...] want to implement something "different" [...]
The slippery-slope argument we're seeing here is that eventually, regulations would require all products and services to be exactly the same for inter-compatibility, which in turn induces a cooling effect on any innovation or novel developments (at least for existing product verticals under regulatory capture).
> [...] want to implement something "different" [...]
The slippery-slope argument we're seeing here is that eventually, regulations would require all products and services to be exactly the same for inter-compatibility, which in turn induces a cooling effect on any innovation or novel developments (at least for existing product verticals under regulatory capture).