How I created Airbnb before Airbnb and travelled the world for 10 years

This emphasises precisely why it's not just having the idea that makes the difference. Execution is the secret sauce, not the original idea. All kinds of people will arrive at the idea and never progress it, so don't bet big on an idea alone without the implementation to back it up.

It's not unlike the phenomenon of independent parties arriving at the same discovery within very close periods of time. The idea itself is often relatively easy - it's the hard work to prove the idea that makes all the difference.