I guess because I think it's too time-consuming, because you know, you are going to create multiple wallets and put in different information. I really thought they are only good at manipulating crypto prices. But they deserved their huge earnings because they took a huge risk there. No need to be jealous at them .
Not really time consuming, if you have money to spare there are automated tools available to farm airdrops these days.
Interactions with new platforms, new smart contracts, must be done with new wallets.
If using (not new) wallets, with big fund inside, to interact with new platforms, new smart contracts, people will put their wallets at risk and they can lose funds in these wallets. If fund is big, like all money they have, it's terrible.
Trying with airdrops is good, like trying lottery tickets but don't risk your funds with it.
Projects usually filter out new wallets. Secure your funds in new wallet, but keep using your oldest one to hunt for airdrops, using new wallets to interact is easies way to get disqualified.