For example Zynga seems quite successful at stealing/cloning game ideas. But they seems to steal only after seeing how successful other games are. Because copyi

For example Zynga seems quite successful at stealing/cloning game ideas. But they seems to steal only after seeing how successful other games are. Because copying an already successful idea has a lower risk then working on an unproved new idea. So only those will work on a new idea who really believes in it, which is probably the one who thinking about and working on it the most (hopefully you). So don't worry too much about others stealing your idea before you successfully execute it.