It'd be very difficult/impossible for it to be avaliable on apple products (Apple usually makes it difficult on purpose). I'm pretty sure it's due to the file type not being supported on Apple or smth, and they would probably have to put it on the app store, which they can't.
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also because it costs a TON of money for it to be on ios + you cant easily download apps from a website online for ios like you can for android, which means the app would have to go on the app store, and then thats copyright infringement and Lunime would have it taken down. Gacha Plus was taken off the play store for that reason.