I'm not a coder or developer but was wondering what can these developer do or see that are sensitive information? Can they farm data about you without you knowing? For example I have this gallary app and saw they as sending data to their servers. I was wondering why does this app which I paid to remove ads need to use my wifi data? I always wonder if they can code something for example to send thumbnail or my images to their severs or something. I saw in a video they built an app and was able to harvest people's personal info on their phone.