I assume that the costs associated with iOS development (and probably greater formality in licensing with regard to the Appstore) make an iPhone/iPad version prohibitive.
Good questions.. there's a few smaller issues.. and one bigger one.
1) I have zero experience with iOS, but Google has a cross platform language / tool set (Flutter) that I've been thinking of diving into. Even if I was already familiar with Flutter I'd have the same problem that:
2) I have no Mac or iPhone to perform basic testing with - unlike Android I need a Mac to develop iOS apps. I do have a 12 year old MacBook that might still work but.. probably not :P
3) There is a much higher cost - $100 a year to be on the AppStore. Google was a one time fee of $25.
4) Licensing - quite possibly issues here, no idea how Apple would handle it. More research required here.
5) The big one - Time. Right now I'm on a very intense full time French Language Training course and adding a programming language to learn on top of it would really hurt me. It may end this fall, which would allow me to start looking into the other iOS issues more at that time.
Hope that better explains my situation and where I'm at with that, cheers!
Terence