Hey! I'm working on my first few games, and I'm trying to learn everything about design I can. One thing though, that I haven't gotten a clear answer on, is how games can be heavily moddable yet not open source? The only realistic answer I've gotten is "In order for your game to support mods, you have to code an entire modding API." Is this the truth? I really want to support the modding community with my games, yet I don't want to make it open source, thus free.
Any answers appreciated, thanks