It is also good you be aware that not all coins have values, some goes dump on mining even before being listed tin the exchange. So while you are inquisitive of participating in the air drop projects, do well to research about the projects potentials so that you don't find your efforts invein.
Participating in the air drop is certainly not a waste of time because I have also been benefited from farming on the projects to make free earning and it has also booted my portfolio.
Definitely when you don't have money or enjoy to buy coins, free earning projects on tasks would be a good approach to encroach your investment goal as the case may detail insufficient funds to buy and own some coins without an airdrop.