But I don't think companies are transparent enough with how they use things and usually ask for very broad licensing and usage rights for what you upload. Sure us tech literate people should and usually are scrutinizing that stuff, but what about the family aunt who just wants to share photos of their nephew with their close ones? On Facebook for example it even tells you you are only sharing posts with "Friends" or "Everyone" (or custom I guess) which might make those people think "oh just my friends see this, not the platform that I'm using"