The entire thesis of why illegal filesharing is not theft is because it is a victimless crime (presuming the pirate was not going to purchase the software anyway.) Stealing bandwidth on an airplane is not a victimless crime, since it reduces the amount of bandwidth for everyone who has paid for it. This is a pretty elementary concept and I'm not really sure why you are twisting things around so much. It's no different than if there was a 10 gallon jug of water on a desert island and you were supposed to pay $5 to take a drink, and some guy comes over and starts chugging it down without paying. That person is stealing since they are using a scarce resource that others are required to pay for.