It's been an established practice for several years now to exclusively allow in-app purchases through websites to avoid the cut on in-app payments. A while back

It's been an established practice for several years now to exclusively allow in-app purchases through websites to avoid the cut on in-app payments. A while back apps would display the catalog of available purchases in app and kick users to a web browser when they went to buy. Apple didn't like that. IIRC this was another big deal with Fortnite. Originally Epic was going to have users download the APKs to get around the play store tariff. I think this prompted Google to offer more favorable terms. More and more it feels like Apple isn't selling hardware so much as licensing hardware. Google has similar issues but it's much easier to get around them. At least they still let users install arbitrary APKs if they enable it in settings.