It’s not an actual problem. Games don’t ship with the editing tools from the engine because engine editing tools aren’t suitable for that purpose.

That would be like shipping photoshop with your game to allow people to customize their character’s hair color.

Maybe they would (different games foster different cultures). Maybe they'd use it as a starting point and derive something more friendly.

The license doesn't indicate that you can get out of the terms by developing your own map editor. A map editor would qualify as a game engine product because it can edit game content and their license specifically prohibits you from redistributing a game engine product that's built with Defold.