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It's true I'm also holing a lot of SIM tokens from dcity and I get daily airdrop for it... I don't really know whether it's an airdrop or a staking reward :-)

Well…. I think that airdrop and holding rewards are the same. You get something for holding something.
Staking rewards could also be an airdrop, but you need something staked, you can’t just hold. So maybe different?
We could keep going and add liquidity pool rewards…. Lol

3 credits added for the liotes ranking