Neither of those cases are the situation in which "stealing an idea" comes up. Both projects were launched in public. As soon as any "idea" is proven to be successful in the market, competitors will arise.
In fact, it is a good argument for not being overly secretive or demanding a 10-page NDA. As soon as you launch, your idea is public anyway, and you are better off telling about it to advisors/investors/developers to give you a better chance at succeeding.
In fact, it is a good argument for not being overly secretive or demanding a 10-page NDA. As soon as you launch, your idea is public anyway, and you are better off telling about it to advisors/investors/developers to give you a better chance at succeeding.