the problem is ultimately that legal jargon being used in that legal context =/= how most people interpreit the word
hence why it's so easy to have people go OMG THEY OWN ALL YOUR STUFF NOW!!!! when really... that's just the legal verbiage they have to use for "and then we store your image on our servers and display it". people see publishing rights and panic but it's more a function of the gap between legal language and common language, as well as legal language vs. new tech.