What are the features and parameters based upon which a score is being calculated(out of 10)? AirBnb is at 37, surely this cannot be based on consumer popularit

What are the features and parameters based upon which a score is being calculated(out of 10)? AirBnb is at 37, surely this cannot be based on consumer popularity. It could be a weighted mean of maturity + valuation + revenue projections + million uniques but even in that case its hard to believe that workflowy is at number 2.