Our companies shared an investor, and our app was the first to implement Coinbase's API. Between that and SF Bitcoin meetups, I interacted with Brian regularly enough and the App Store was a common topic because in that first year of funding for crypto, the goal was generally find a way to breaking Bitcoin mainstream. (It seemed like it might happen soon, but was in fact still quite early.)
After some press, Apple took our app down. I blogged about it [0], (I believe the first survey of App Store policy toward bitcoin) and that got picked up by Tech Crunch. [1]
I remember speaking with Brian about it on the phone. Apple's objection was on legality of sending Bitcoin in the regions our app was available, so I suggested we could file a legal brief as part of our appeal.
Brian's response was they had already tried that and that Apple was unswayed by their brief. There wasn't much we could really do other than commiserate on being under the thumb of the App Store.
Those were some heady, yet comparatively innocent days in crypto compared to now.
[0] https://blog.gli.ph/2013/12/09/the-state-of-bitcoin-mobile-a...
[1] https://techcrunch.com/2013/12/09/how-does-apple-really-feel...