basically no money from airdrops, over 99 percent are scams or fake or phishing attempts. you will make more working a regular job in real life.
I disagree a bit for this, we can all admit that some airdrops are fully scam and fraud but there are some projects having legit airdrops and if you are lucky you can get some big amounts of airdrops in token but that is a super rare project, most of them offer small amounts of rewards that the real-life job is better than it that's why some bounty hunter tends to expand their participation with lots of airdrop rewards.
I agree with your opinion that paid or unpaid depends on the project. Not all airdrops do not pay. Therefore we must be careful in choosing a project or airdrop.