[acrefoot]

Natural monopolies are ones where the barrier to entry to provide a service is high. Like a nuclear power company. This fragmentation isn't really in the same category, since clearly many companies have the ability to create a music streaming service or game store with some form of content.

[anoncake]

Natural monopolies are ones where having multiple competing services doesn't make sense. Nuclear power isn't, to the extend NPPs make sense it makes sense to have multiple.

[beefield]

Network effects can be and in this case very much are a barrier to entry.

[amelius]

But how many can create a hardware platform like an iphone?