I would argue the root cause of this is administrative creep. Faculty don't care about student movements accross campus, but for administratos it's an opportunity to improve their job security and expand the role of the beurocracy.

Most of these technologies are solutions in search of problems. There is no need for invasive proctoring software if students just take exams in person like they always have. There are presently too many economic incentives to violate people's privacy and almost none to protect it.