Sending 0ETH can reduce your workload.
It's my point,it can make a smart contract automatically refunded token.
I see. I want to store the airdrop in the blockchain. So when you sign up, you are actually stored in the blockchain and a function call will run the airdrop, so everybody will get the same amount. I won't do this manually.
I wonder when your project will start, also you need to have a compelling product to make your project successful. Good Luck.