This would be the first ever cryptocurrency based application and in reality, they would like to leave a good impression to customers or users. They would need to take note of the following:
1. Safety of customers
2. The "legit-ness" of they application
But then again, it won't hurt to try doing that deposit and withdraw method, though it will cost you.
I agree, this would be the very first mobile application that would accept cryptocurrency as payment for games and such. Congratulation AppCoins! Hoping that the proceedings after the pre-sale would be a success as well!