Does Apple get a cut of Uber fares from in-app purchases? (I think the standard amount is 30%.) If that's the case, the money lost would be one more reason for Apply not to do this, or perhaps a reason to reject the Uber app if Uber refused to pay.
It doesn't, Uber processes their payments themselves. You don't have to pay the Apple tax for physical goods or services.
If it's an IAP (In-App-Purchase), then there would be a 30% cut. But Uber and Lyft are simply using Apple Pay or card on file for transactions. They may take a smaller skim though, anyone have the answer to this?