Yes, Wikipedia gets its content largely by hovering up the web, without the consent of the authors. For example you can cite a New York Times article in Wikipedia, without getting the consent of the NYT author. Wikipedia also "hoovers up" (as you put it) offline sources like books. Again without consent!
Indeed, the need to get consent from the author before reading a published work Isn't A Thing in general, outside some very specific contractural scenarios.
Indeed, the need to get consent from the author before reading a published work Isn't A Thing in general, outside some very specific contractural scenarios.