They don't like for others to sneak it out because they do highly believe that they are the first ever on having that so called idea into their minds.
then this is not the way to do it.
they should not reveal the idea to anybody. instead they should interview people and then hire those they choose, build a contract and even make them sign a non disclosure agreement and then tell them the "idea" after they've hired and paid them as employees.
otherwise, in this world where people seek open source projects and create them, keeping the idea secret doesn't mean anything!
