The initial prize pool funded by Valve has been raised to that amount with battle pass and other purchases.
It's amazing how the prize pool for The International just keeps going up year after year - this shows the enthusiasm people have for E-Sports.
Check out the Dota 2 Battlepass Page
(Photos edited by me from http://www.dota2.com/international/battlepass/)
Thanks!
(Photos edited by me from http://www.dota2.com/international/battlepass/)
Thanks!