BUT, I will also mention that part of its market capture comes from all the charges on devs even before the rev share. You need apple equipment to develop, and they (apparently) don't sell server racks anymore for businesses to scale off of, nor any legitimate form of emulation. You have a small cost per year to have a developer account, and a cost to submit your app for review. Then if you care about visibilty they have their own ad discovery program you can pay into.
So I did disagree with a brief judge statement about how "It's possible to skirt around Apple's innnovation for free...". Apple controls and charges for the entire pipeline, even before you launch the app.