I’m sorry for adding the map_editor example. The reason why I addded it is because if one day I want to create a map editor for a friends game that is already working and published, seems like I can’t do it without making him pay royalties.
Anyhow, taking out the map editor out of the ecuation, will I need to pay royalties for the game if I distribute the chat app along with it and the chat app is free? it will not be used to create any content for the game, but you will be able to talk to people that are already in game, and it may use some textures from the game to make the UI feel in sync with the game.