Zksync is coming sooner or later, days ago they have released their ZKsync ERA which is their Mainnet, if you want to qualify for this airdrop, you will have to do some transactions on the Mainnet too, I know some have done a lot of transactions on the testnet and the zksync 1.0 lite version, remember that this is the Mainnet, Bridge your wallet to the Miannet and start doing some transactions before its too late, ZKsync will be bigger than Arbitrum airdrop.
Could be bigger than arbitrum, maybe yes or no depending on the official information about the reward system. No official info has been released yet only speculations from twitter airdrop influencer's because they say similar thing with other project they promote.
Although it won't cost much to interact with the mainnet not to lose out on a possible juicy opportunity, the possibility of not recieveing at all is also there.
Yeah i will also suggest anyone interested to try out the network, even though they claim to be L2 a solution to eth scalability the network fees are not cheap.
