I don't think the intent is to say that this is the only way it works. It's probably just to show these are the common patterns while piggybacking. The luck bit goes without saying.
Yeah, as the other commenter says, 'siphoning' is probably better though it is still stealing if you don't think of traffic as a zero-sum game. It's after all only in zero-sum games like physical goods that stealing reduces value to the owner.