[worldofmatthew]

Your smart TV would make you risk going to prison for theft? Just because its open does not mean permission to use.

[Tor3]

Huh? Open networks are open. You don't go to prison for that. Anyway, as the next comment said, there aren't many open networks anymore, though you'll still find some (see other comment)

[inigyou]

Walking into a random house's open door is still illegal.

Anyway, intent matters. This probably wouldn't be found criminal unless there was malicious intent.