Earlier quoted context omitted.
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.
Here's what the license states: You do not sell or otherwise commercialise the Work or Derivative Works as a Game Engine Product. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derive…
Thank you, after re-reading, I agree.