The bottom line is simple: if a user does something in the editor of Warcraft III: Reforged, he does not have the legal right to reproduce it on another technology base, since the content is wholly owned by Blizzard.
Now, if in Warcraft III: Reforged someone creates something truly popular, they can legally develop the title only at Blizzard or with the permission of the company. The publisher is clearly not ready to lose another Dota.
Warcraft III: Reforged came out today, gathering a lot of discontent from the players. Some are upset by the downgrade of the graphics, others by the lack of promised innovations, including cutscenes and an interface.
Some people think that the updated graphics look even worse than the original.