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Apple most certainly does allow the development of software by competitors--and anyone else that wants to develop. The difference is that Apple bothers to check and at least attempt to vet that software before it goes up for sale--unlike the others.

Those fancy touch screens? Here you really need to do some research. Even when the device has been run over by a car and the screen a total spider's web of cracks, the owner can still use it in most cases--unlike, again, their competitors.