My partner was in a class at Berkeley where different teams devised ML projects and implemented them. One of the team's idea was to "combat obesity" by installing cameras in elementary schools to monitor the children's estimated weight and notify their parents if it seemed like the kid was getting fatter. The only thing more disturbing was that they called a bunch of elementary schools and got very enthusiastic responses from the schools - their presentation included a quote like "where have you been all this time?" from a school principal.