For companies revenue and especially profit margin share usually matters much more. If an iPhone user in the US etc. is worth >= 10x more than an user in a third world country (both for manufacturers and ad/service providers that’s a win).
Apple could probably get > 50% market share in those countries if they significantly reduced their margins (they’d still be profitable but of course it makes little sense m)
There are 195 official countries in the world, many of those have close to zero iPhone customers, and surely the companies on those countries also need customers.
Truth is Apple doesn't care about those countries where regular citizens cannot afford Apple, they see themselves as the Ferrari, Bentley, Karan Acoustics, ... of the computer world.
They certainly don’t see themselves that way. Maybe Lexus or Audi, but not even that.
Those are very niche luxury brands, that sell impractical status products (there isn’t really and equivalent for them in the “computer world”) for the 1% or subset of it. Apple is not that, it’s an upper middle tier mass market brand.
But yes, they certainly don’t care about markets where they can’t be competitive while maintaining their margins