I've been called a curmudgeon for this, but it really bothers me when I see new diviners give readings without consent. I love the enthusiasm, but readings create a link and a lot of us are very careful about who we link with. Also, if you're going around randomly reading experienced witches who have shielding in place, you have no idea what's going to bounce back energetically. At the very least the reading is nonsense, and then they get offended. Just ask.