Laws are exciting and important (especially good ones like Newton's laws of motion), but laws could improve too: If someone gets caught doing this they probably ought to do community service working on some bug bounty program instead of going to jail.
True, you're less likely to actually be convicted, but the months/years waiting for trail is guaranteed to be worse than your actual sentence elsewhere, if not fatal.
If you think LLE or even the FBI is going to open the diplomatic channels necessary to pursue someone in Nigeria over access to a consumer-grade router, you're kidding yourself. For all practical purposes, these laws do not in fact apply there.
There are very few places outside the reach of US law enforcement. Especially if they bother to get Interpol involved.
Orders of magnitude more likely to find an open WiFi in a bank's parking lot than you are to find a WAN-facing consumer-grade router. Any employee in the company could screw up the former ("I didn't get good wifi so I brought in a router from home!"). The latter requires grossly incompetent netsec.