[tinalumfoil]

"Don't worry about people stealing your ideas. If your ideas are any good, you'll have to ram them down people's throats." - https://en.wikiquote.org/wiki/Howard_H._Aiken

Also, the same skills required to come up with good ideas are probably the same skills required to make those ideas work. If you're experienced enough to know there's a need in some market, you'll only succeed if you have experience enough to develop and sell a solution. So, if someone successfully takes the market from under you they were probably already ahead of you even when you were first.

But the above quote is also why I'm skeptical of validating ideas in the landing page stage. The walkman was just as good as the iPod until I spent 5 minutes using the iPod, but no landing page would've convinced me.