Airdrops is a good and fast enough way to earn. But you need to join their huge amount because for 1 airdrop you get usually a little. And unlike the bounty it will not be so insulting to get anything since you do not spend a month doing tasks for which you can get nothing.
What do you mean by joining large numbers in airdrop? If you mean to join a lot of projects that provide airdrop, in my opinion it will still be useless because the results obtained remain small and with different projects or coins, so that it will make a lot of rubbish in the wallet.