How do you prevent people stealing other’s ideas? I feel it’s risky to post your possibly-millions-worth business idea in the Internet.
The idea itself isn't really the hard part of building a company. Otherwise, people would be "selling" ideas, and not businesses[0]!
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.
The reason people sell businesses, not ideas, is precisely that it's so easy to steal ideas. So why buy one?
The reason people don't buy ideas is because ideas are worthless without execution. An idea with execution is already a business.
When I was a young environmentalist, I was very concerned with the problem of toilet paper waste.
I wasted hundreds of hours working on a reusable Loofah + Bidet system, it was a product that absolutely nobody wanted.
Are you laughing? Because its not a joke.
Tools like this one could have helped me move on to a better idea, and saved me a lot of time and heartache.