According to ChainCatcher, ZK Nation stated in its latest FAQ document that even if all 7 criteria are met, there is still a possibility that there is no qualification for airdropping.
ZKsync user airdrop allocation is based on the following combination:
how many of the seven eligibility criteria were met;
The amount bridged and held on ZKsync Era (either in the user’s wallet or in DeFi protocols) based on the time-weighted average balance (TWAB) over the 12 months ending on the snapshot date;
Bonus Multiplier: If a wallet is part of a predefined group, such as early ETH adopters, holders of top ZKsync native NFTs/tokens, or holders of airdrops like ARB, OP, ENS, etc., it will receive an allocation multiplier.
Therefore the transaction volume itself has no effect on the size of the allocation.
This means that even if a user meets all seven criteria, but has a low average holding amount over a period of time, or does not qualify for any of the other bonus multipliers, they may not qualify for a distribution.