You don't spend money on air drops, It is necessary to know the purpose of air drops bounty campaign, for benefits of the doubt, air drops are actually means used by certain projects, to rewards participants for carrying out some specific task on social networks and Cryptocurrency forums.
Air drops rewards are completely Free, the are no fees payment for rewards distributions to air drops hunters.
In addition, Air drops are actually aimed to spread awareness by new start up projects and to encourage participations
Well, there are still some airdrops out there where you can get their tokens FOR FREE, but the question is, is the time that you're spending worth it? I mean if you're doing it for around an hour a day, that's 30 hours a month. 30 hours that could've been used for something more efficient like watching educational videos, or learning more about cryptocurrency, but instead, you used it into something that considered "INEFFICIENT" and not worthy... at least for me.
Sorry, but free airdrops aren't worth the time that you're spending. Yes, they exist, but if you want to have the highest amount of free tokens that you want, you need to either spend some bucks on it, or gather many referrals. Airdrops are a way for these developers to start their project, but the downside to this is that, those who got the tokens for free will just sell it immediately without a doubt. Just look at PI token right now. Many got it for free, and many are selling it right now because they don't want to hold a token that has a downward price movement.
Airdrops are free, but not worth it if you will ask me. Can you please give me an airdrop last year where it's free, and you got at least $100 on it? No investment needed, and no referrals needed, but you got 3-digit amount for free.