Exactly, it's such a short-sighted way of thinking to consider the current share of revenue. Most of poor Asian countries will eventually get rich, and giving up those markets means giving up future profits. If you don't build brand recognition while the country is still poor, others will do it, and then you'll be fighting an uphill battle, especially considering how half of the value of having Apple hardware is the brand.
If 5% of population (14M people) can afford an iPhone, it's already bigger than a lot of potential markets around the world. I'm sure they do a much more thorough analysis at Apple though.
.. You should travel to Indonesia. Almost nobody has Apple products, the majority of people such as gig workers (GoJek) earn less than $10 per day. GoJek riders earn more than average, labour is incredibly cheap in Indonesia.
vivo and similar low-cost Android phones for the Indian market are popular.