Making money, especially free, is always profitable, but you also need to know when to sell or hold the token you receive. Even if I don't know that this project will be successful, I just recommend making money, even if the small money you spend on this project can quickly increase your profit in three times.
it's not always profitable, because may airdrops are scams which will rob you for your other tokens, so you will end up in loss eventually. You need to think broader than this