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

[valehelle]

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.