So, I know GZDoom has been used in a few chunk of games released on steam and has been used for many other wads that do use some regular .wad assets, but I wanted to ask, right from the people who know 10x more about this stuff than me: What's the legality? As in, what am i allowed to do with GZ if I want to make my own game with it? Can I make a game with it and upload it to itch.io just fine? Steam (if I had the money)?
I know if I wanted to, I cant use any doom assets, which is a given. But assuming I made everything that would in the .wad myself, what about the engine? Can I edit the exe name and icon? Do people make their own forks and build it that way, or do people only use the regular editors you'd expect (Slade3 and UDB)?
And also, as someone who hasn't used GZ since they first started dooming, how customizable is it w/o building from source (i.e., can you make your own settings menu, can you force certain things like antialiasing/resolution scaling or something to keep the game looking kinda crunchy?)
Trying to get all the information I need before I even consider doing something like that.