Depending on who you ask an GPL game engine can only produce GPL games. I guess you could sell the game ready to play, and then upload its source code without

Depending on who you ask an GPL game engine can only produce GPL games. I guess you could sell the game ready to play, and then upload its source code without needed assets somewhere else. Most companies aren’t going to be ok with this. I know when I write a project, I just MIT license it. If some of the code I wrote helps you get your job done, go for it.