I know that we can earn money through airdrop because airdrop is free coins and giving opportunity to anyone who want to earn eth token, but my question is anyone here who got rich because of joining airdrop campaign?
There is nothing free in anywhere. If you don't pay for the product then you are the product.
Airdrops are waste of time. You need to fill forms in the most simple ones and you wasted your time. You don't even know if they pay or not.