I don't think Hades original concern was specifically that people would be able to manipulate the game for their own ends via the DDF but more that a bunch of nostalgic players who happen to have a load of money to throw at the game might not be the best people to be involved in influencing the design direction of the game (and seemingly various persistent elements post release).
You may have a large number of people who want to dumb the flying down and focus more on the intricacies of trading and pushing it into being more of an MMO, or you may have people intent on pushing it into as much of a space shuttle flight simulator as they possibly can.
I suppose it depends on your perspective and experience of how people tend to be in those situations as to whether you think that's a particularly concerning issue.