Echos of iPhone competitors...

There's such a huge incentive for these services that are natural monopolies to be adopted by users. What happens when Kindle is the only eBook with a library, Apple is the only hardware with an appstore, or when Windows is the only OS? Stagnation of innovation, which is what these platforms are supposed to be fighting.

I think the root problem is that while the things that these monopolies do are solved problems, they aren't implemented that way...