While the laws are vague, there is precedent on both sides. Regardless of whether it is a ‘criminal’ act, it is usually forbidden by the TOS of your internet service to willfully share your internet connection with neighbors.
Why not borrow your neighbors car or walk into their garage and help yourself to some of their tools as well? I’m sure you’ll bring them back eh? No harm done?
I guess people will try to justify all kinds of behavior these days.