I thought, (although the rules might have changed), that Apple explicitly forbids having different prices between your website and the app, and will kick you out of the store if it finds you doing this?
According to this article Spotify was charging 30% more on iOS all the way back until 2016 with multiple other prominent examples still existing today, so I don't think that this is true or at least hasn't been true since at least 8 years: https://www.forbes.com/sites/shaharziv/2020/07/08/heres-why-...