Right, no-one can't. But assuming you meant no-one can, that is false. Every full style made is just a mod that changes the way Bully, a game none of us made, works. It takes a style already made by Rockstar and makes it a little more playable. Nobody here owns any copyright/material related to the style and you certainly have the freedom to release any content you wish. Anyone who stops you must be a credit-whore who doesn't want you to shine so they can, or is just a dictator that doesn't want the modding community to progress. If you make the mod, you can release it. If you make a mod using other people's codes that they developed, you can release it only if they agree. If you make a mod using code from the game that someone found before you, you can release it as they didn't make shit, but just found something already created by Rockstar (such as a node/native lua function).