There is no way for you to check if they add something to or remove from the code before they compile it and put it into store from which you download to your phone. You have to trust company regardless.
I do miss your point. In both cases I have to trust that company is not maliciously lying and doing something. If anything, the bigger the company the higher likelihood that if something malicious is going on it becomes known through whistleblowers.
I use iPhone. I do not think it is an option for non-developer to install anything on it without jailbreak (which I also would never do).
In general the attitude that one can avoid trusting private company that builds airplanes by designing and building an airplane (and flying) yourself will not get you far.
But these questions are true for any app. The only one which was verified is iMessage, because of that FBI case.
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Are you compiling and installing compiled version yourself onto your phone?
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There is no way for you to check if they add something to or remove from the code before they compile it and put it into store from which you download to your phone. You have to trust company regardless.
deleted by creator
I do miss your point. In both cases I have to trust that company is not maliciously lying and doing something. If anything, the bigger the company the higher likelihood that if something malicious is going on it becomes known through whistleblowers.
deleted by creator
I use iPhone. I do not think it is an option for non-developer to install anything on it without jailbreak (which I also would never do).
In general the attitude that one can avoid trusting private company that builds airplanes by designing and building an airplane (and flying) yourself will not get you far.