This.
It basically goes like this:
"Hey guys, we’re letting you fund the eSport winnings by buying these toys! 25% of your purchase will go to the eSport prize pool.
And don’t worry, in case no one buys the toys, we’ll ensure there’s a minimum of $500.000 in the prize pool.
If lots of people buy the toys and you generate more than $500.000, awesome!"
Seemingly we’ve purchased enough toys to generate $660.000 for the prize pool, which is quite impressive, and thus Blizzard’s guarantee doesn’t come into play, because we’re well above the minimum.
Hypothetically, let’s say the sale of the toys had only generated $200.000 in prize pools. If that was the case, then Blizzard would supply the remaining $300.000 to reach the guaranteed minimum of $500.000.
But $660.000 is well above $500.000, so yay, go us! 