Airbnb, stupid idea nobody will ever do it. Uber, nobody wants random people in their car. Also it’s illegal. Google, compete with yahoo? Come on. Netflix, Blockbuster turned down buying them for a few million. What does THAT tell you?!
This validation idea fails the falsifiability test.(can you prove the inverse). IE it will not give the actual > billion dollar startups a good rating. (I haven’t tested, just giving this idea the same treatment it claims every other idea should get).