Ask HN: What happen if Facebook, Twitter, Uber founder follow the lean startup?

As per title, what would happen if Facebook, Twitter, Uber and other big company founder follow the lean startup method in the early days?

I'm talking about creating a 1 page website to track potential interest. Would they still persist with the idea?

I remember Pinterest founder says that he is glad he did not read the book "The Lean Startup" because it might have convinced him to give up at that point.