If someone is assuming that hacking/breaking into a WiFi router for piggybacking on the router’s internet connection is illegal, then he/she needs to double check the same with the applicable CyberLaw ...
Back in the 1990’s moving files via a floppy disk was known as “sneaker net.” While floppies are a thing of the past, SD Cards are the modern equivalent and they still lend themselves to sneaker net ...