I don't think a disagree. I think this is exactly what makes this so tricky. On the consumer side, users have a choice, pick their favorite, occasionally switch when they buy a new phone, and are generally content.
However on the supply side, there are 2 disjoint monopolies. You reach iOS users through Apple's monopoly on iOS distribution, and you reach Android users through Google's [near-]monopoly on Android distribution.
To continue the hurt analogy, it's the difference between there being 2 restaurant chains in every town and there being 1 restaurant chain for the Eastern US and a different chain for the Western US (and moving across the country cost $400-$800).
However on the supply side, there are 2 disjoint monopolies. You reach iOS users through Apple's monopoly on iOS distribution, and you reach Android users through Google's [near-]monopoly on Android distribution.
To continue the hurt analogy, it's the difference between there being 2 restaurant chains in every town and there being 1 restaurant chain for the Eastern US and a different chain for the Western US (and moving across the country cost $400-$800).