[matt_kantor]

> If your app enables the purchase of realtime person-to-person experiences between two individuals (for example tutoring students, medical consultations, real estate tours, or fitness training), you may use purchase methods other than in-app purchase to collect those payments.

So you can avoid the Apple tax if you're a private tutor.

However it looks like I misread blueicecubes' comment. They were asking about one-to-few vs one-to-many, but I talked about one-to-one.