It's still not what everybody are talking about (photo/video recording). The amount of data which can probably be sent to somebody is not bigger as it would be if you used your Google or Apple maps.

The code is there somewhere is not actually an answer. It should be there or all the theories are just attempts to gather some attention. And there are not only thousands of REs, as I've mentioned, the code was explored by the game hackers and clone makers too.
And yes, you can check the amount of data that the game sends. It will require an android device, some services disabled, some tools installed.