DeFi is not only complex from a technical standpoint but from an accounting standpoint as well. You need to keep track of your initial trades, your initial stakes in the pools/dens and the cost basis of each coin you earn and later sell. That's not difficult but you must remember to do it. Some people preferred to sell their airdrop.

But that's nothing unexpected. No airdrop is ever held 100%. I think this airdrop was successful in terms of achieving adoption.