My guess (with no inside knowledge): they are dropping GPL because many companies have a strict "no GPL" policy and, unfortunately, those companies don't unders

My guess (with no inside knowledge): they are dropping GPL because many companies have a strict "no GPL" policy and, unfortunately, those companies don't understand the notion of duel licensing. Furthermore, that confusion only harms the JQuery project, as the philosophical a aspects of the GPL aren't driving their open source philosophy. So it's not exactly FUD about the GPL. Companies can have very legitimate reasons for wanting to stay away from it. I would call it a more general legal ignorance on the companies' parts with pragmatism on jquery's.