Ah, wonderful. A platform where Apple can remove backward compatibility even more easily, and which forces you out of the other subscription services.

The big difference between games and other software, is that typical devs also profit from Apple making changes, e.g. Adobe managing to deprecate their previous licences and switch to subscription-only without backlash since it's Apple changing the platform. So Adobe loses a bit from porting, but gains more from new subscriptions.

Old games are almost never ported as is, at best they're "remade/remastered" which is a serious investment. So Apple making changes and choosing their own APIs is a pure loss for gamedevs. That's hardly the only problem but that's a big one.