I don't think anyone would argue that it costs nothing to do this. Nor would they argue that it's easy. The argument would simply be whether or not it's cost effective. Can it be done for less than the costs of launching a fully developed habitat from the ground.
That's the job of the company providing the work. If they can make it work, more power to them. If they can't, failed business model. If they can't and it gets funded through tax dollars as a huge boondoggle, then it becomes a problem for the masses.
Prove that it can't be done cost effectively. Not random "Oh sure!! That'll work great!!! No costs at all!"