Well ... I am not a lawyer ... but being "free" is not the same thing as "not protected by copyright". Steve Swann created the scenarios, they are his products and don't enter the public domain for another 70 years (give or take), unless he explicitly releases them to public domain before that point. If they were in the PD, someone else could reformat them, remove all references to Steve and sell them to other people for as much (or as little) as they chose.
However, I imagine that Steve didn't explicitly release them to PD, he just chose to make them available to anyone who wants them, for no charge. There's nothing wrong with that, but it does mean that if someone else tried to sell them, or even just pass them off as their own products, Steve would potentially have legal options to prevent that. (That's where actual lawyers would get involved.)
The question Robin should have asked was, are these scenarios part of a product that you normally have to pay for, in which case, distributing them for free without the explicit permission of the owner would be a bad thing. Even if they were free, distributing them without the permission of the owner would still be a bad thing, although in that case I would think it unlikely (in most circumstances) that the owner would bother complaining about it.