I think airdrops have lost its credibility, most of these airdrops are a scam. I have joined a plenty of them, but haven't got any rewards. It is a complete waste of time, so it would be better to concentrate on other things.
not all Airdrop is a fraud .. just a small part who take advantage with the hard work of others. But the income from Airdrop is minimal and the job is also very easy and only once work.