There are 67 projects on zkysnc that have received airdrops. The largest AAVE has 8.3 million zk, and the smallest has 810,000 zk. Familiar projects include CURVE, ETHERFI, IZUMI, etc. You can check this list to see if you have used it. Maybe there will be airdrops to users later.

https://github.com/ZKsync-Association/zknation-data/blob/main/zksync_native_project_list.csv