If that poster blocks vpns, they probably know how to install a root CA and block any non-intercepted traffic (and then apply content filtering), as well as dis

If that poster blocks vpns, they probably know how to install a root CA and block any non-intercepted traffic (and then apply content filtering), as well as disable USB boot and set a BIOS password. Sure a sufficiently technical kid could defeat that (do motherboards still have BIOS reset jumpers?), but most kids aren't going to be that technical, and even if they were, any kind of video would be (immediately, at a visual glance) obvious in traffic monitoring software. So at least at home, it's pretty easy to win the cat and mouse game as a technical person if you wanted to. At places like schools, the IT guy probably doesn't really care so is easy to "defeat" (mine knew we played cracked copies of counterstrike and starcraft off the network drive and never did anything about it).