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https://faqs.ankiweb.net/why-does-ankimobile-cost-more-than-...

Here's the FAQ entry for why it costs as much as it does for iOS/iPadOS with some explanation for why he only charges on those platforms.

Since there's a mobile-optimized web version, it's also free-ish on iOS.

I know people who have used it on iOS for years for free by just using the web version and never buying the app, and they seem quite happy with that setup.

IIRC the Android app is free because it wasn't started by Anki's original author. It was created by some other folks, using the source for Anki desktop.

I imagine people with iphones have more disposable income and wouldn't be as affected by a cost compared to charging android users.