Regarding the auditing social media, it's not just about their posts, but who they are friends with and who are friends with them. Point and case, your personal social media profile may be benign photos of kittens and snaps of what you had to eat that day, but your brother could be "friends" with terrorist or member of a criminal gang and that person could use your relationship with your bother to extort you after you enter the U.S.A.
Biden's administration let at least 2700 Tren de Aragua gang members walk across the southern boarder. ICE and DHS have successfully arrested these TDA members, but there are more. These people rape, murder, traffic humans and drugs into the U.S.A. Their criminal network (and therefore profits) have been severely disrupted. It's common sense that they are going to seek new and creative ways to get back in business. As they already extort and exploit on a daily basis in Venezuela, why wouldn't they do the same to potential foreign students?
This is just one example.