[jjk166]

Let's say I own a restaurant. Someone comes in and wants a panini. I don't have a panini press, but the restaurant next door does.

If I tell the customer they can go next door to get a panini, I'm not stealing anything. Maybe that restaurant is packed right now and they'ed rather not have an extra customer, but there is a reasonable expectation that they would generally want customers or at least have a means of turning away unwanted customers otherwise.

On the other hand if I break into my neighbor's restaurant, make a panini, then bring it back to my restaurant to serve and make money off of, all without permission from the neighbor, I am most definitely stealing. Even if I doubt the neighbor will mind because he let me come over and make myself a panini once, I can't unilaterally act off that assumption.