In 2017 before the bullish market run, airdrops use to pay handsome rewards to participants. I remember, one airdrop called ZCash gold rewarded me $1K whereas Lympo gave me $500. Of late, airdrops do not pay this much but rather give out gas fees which may range from $1 to $20 on the average.
Amount that airdrops gives now can really be very annoying, people might not feel it as much as we that has really tested what airdrops was like in 2017, one of my airdrop then paid me $1200 and then when the bull run of altcoins started, it multiplied by x7 and that was where my stupidity started to have believe that was how the coin will continue to grow, until I was first introduced to the first bear of my life that took away virtually all my investment.
Airdrops now are so shitty that it really does not worth my time. If they were still paying often, we could still be joining as much as we can since airdrops are not really that stressful, but you could take like 10 airdrops now, and not get more than one that will pay you that little money and expect you to do something with it.