i bet in the T&C it says they pay you $1,000,000 a year for 1000 years. No way in hell they would ever shell out a Billion.
This is probably true....
But, almost all contests like this and the ones you see at halftime of game (make a half court shot, shoot a puck 100' into a small holl at the net, etc...) are covered by an insurance company just in case lightning strikes.
The insurance company weighs the odds and charges $XXX to Kalshi so that Kalshi isn't liable no matter what happens.
Now the insurance company probably has some BS terms for paying it out for sure because we all know insurance companies can be a$$holes.