It's two miles away and it makes a difference because you would then have to build in about another

But Hotwire lists the companies the rental can possibly be from (all the majors) and says it is "in terminal". However, I know for a fact one of the companies they name has no location in terminal (SIXT), it is 2 miles away. I called Hotwire to ask them what's up with that, and the CS agent claims that was just a list of all their partners to give you an idea, but if the quote said "in terminal" it definitely would be and no shuttle would be involved and it wouldn't be SIXT if they were 2 miles away.
Interestingly, when I've searched for lodging via Hotwire, their descriptions of the places they were offering were SO detailed and accurate that I have never had a problem figuring out which place they were talking about. I once paid $80 for a night at a 4 to 5 star lodging; and got EXACTLY the place I thought I was going to get!
It's two miles away and it makes a difference because you would then have to build in about another hour to get back to the terminal, that's why. SIXT told me that I should get there an extra hour early, and they can't promise how often their shuttles run. I don't have an extra hour to bulid onto my flight time to save a little money.
If the website indeed says "IN the terminal" for the airport pick up you are requesting and for some reason they give you one that is not, I honestly don't think they'd balk at letting you cancel it, and hardly suspect you'd have to threaten them with a law suit to do so.
It seems to me that the inclusion of names of a company that does not have an office IN the terminal is just that they list all the companies they normally deal with in ALL airports. But if you are booking at a specific airport and it does say "in the terminal" then I honestly don't see how they could give you a company that isn't!