Warzone Airdrops are a weekly reward for active traders and creators who are not the biggest wallets. Each chain runs its own airdrop with its own pot, in that chain's coin.
The weekly window closes on Monday at 00:00 UTC. Winners are picked from the closed week and published shortly after. The pot is split over the winners, so a bigger pot means more winners.
The Airdrops tab shows the running week, the current pool, a preview of who is eligible and past winners. The preview is an estimate, and the final list is made at the drop.