Yeah other reasons I've heard of include the obligation to adopt iOS-specific APIs for features like scrolling and text inputs; developing a separate app for these markets and therefore loosing their existing userbase; and signing a pretty crazy contract, among other things.
But the bigger the market they can reach, the bigger the reward, and so at some point it may justify investing resources to work around those roadblocks and accept the drawbacks.
But the bigger the market they can reach, the bigger the reward, and so at some point it may justify investing resources to work around those roadblocks and accept the drawbacks.