[_0ffh]

You could A/B test different app behaviour with the same binary by branching on some pseudorandom (quasi-) constant like IMEI or phone number.

[madeofpalk]

Sure. But once you know that everyone has the same binary, you can reverse engineer the binary you know everyone has.

[willstrafach]

The nice thing is that you can reverse engineer it and sniff traffic to find out what the A/B tests are and what they do.