[croon]

Yes, they have been doing it on a platform (Windows, originally) that didn't come preinstalled with it, by being better than any other storefront, even when taking 30% and you have other options.

Appstore is doing it by being the only allowed storefront on a general computing device.

So yeah, your comparison is great if you mean to say that Appstore and Steam should compete under the same conditions.

Get Steam onto iOS and we'll see if the store cuts stay the same, for either party.