Apple doesn't charge 30% for physical good sold through apps on ios.
What if, instead of 'subscribing' for $10, you purchase a grain of sand for $10.
The grain of sand is available for collection from somewhere, doesn't matter where because nobody would bother to collect it. Your physical purchase comes with free access to digital content.
So Patreon would have to actually staff a location somewhere that distributes the sand.
> staff a location
still costs less than 30% of all ios revenue