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Then you ask yourself why the goals were set the way they were. Obvious guess at an answer: because they only want to target "mobile" and Android+iOS cover most "mobile" clients. Had iOS had less market share, I will bet the goal would have been Android-only (modulo advice by lawyers based on antitrust worries in that situation, of course).
No malice anywhere along here, but the end result is not so distinguishable from malice, sadly.
That's the other easy explanation as to "why iOS?"
Note, not picking on you, just Internet in general.
The old saying was "Windows is not done until Lotus won't run", and the DR-DOS case shows it might not have been an exaggeration