So google does not scan all content from gmail, Drive, g+ etc., and facebook does not claim ownership over photos uploaded to facebook? Sure they may not yet have misused all that date, furthermore you guys may very well be right in that they won’t do that since it wouldn’t be in there own interest to do so. However that doesn’t make may argument of caution any less relevant.
You can learn to live with almost anything, doesn’t mean it is right or that you wouldn’t want it any other way. As these tech giants become larger and more dominating by the day there are fewer alternatives. Sure there are other search engines, social networks and so on, but what is the use if no one uses it? Which is why I say you essentially don’t have a choice, although you’ll probably get used to your privacy being violated.
Although It may currently be 100% your choice what is viewable by others, this may not continue to be the case. As the rules are gradually, over time, altered and people accept these subtle changes, which may in the long run become something that would be unthinkable and unacceptable today.
Privacy always needs to be a concern, and I’m glad that there are people that keep an eye on and speak up when there is reason for concern, especially since policy makers are finding it increasingly difficult to keep up with the pace of technological development. We should never just assume that what these companies do is in our best interest, there ultimate goal is to make profit. Also the argument ‘you don’t have to use these services’ is becoming less and less true as these things become more and more integrated into our lives, which is why we can’t just blindly trust these companies to always act in the general public interests.