Make your idea so out-of-the-box that the people with immediate skills to implement it, won't (or can't).
What does that mean? Pick an idea that is either inherently non-technical or requires significant non-technical work to launch. Your idea can't be stolen if it takes a massive amount of research and pre-programming work to launch. Most hackers (typically the people most capable of executing quickly) will try to solve a problem technically. So, don't solve the problem technically.
Comments
Make your idea so out-of-the-box that the people with immediate skills to implement it, won't (or can't).
What does that mean? Pick an idea that is either inherently non-technical or requires significant non-technical work to launch. Your idea can't be stolen if it takes a massive amount of research and pre-programming work to launch. Most hackers (typically the people most capable of executing quickly) will try to solve a problem technically. So, don't solve the problem technically.