Exactly.
Anyone BUT AH and MS/Asobo are allowed to make their version. But they are less likely to do so now that everyone already has a DC-3 in their hangar.
Sometimes we get a payware Porter by a different developer that is better than the Porter we all have in sim. But it is safe to say folks are less likely to buy a second version of the same plane if they already have one for free. So developers aren’t exactly rushing to make a second version of a plane that already exists in sim.