Among Airdrops, there are a lot of scams or those that are created in order to get your personal data, then put them into a database and sell them. I participated in many Airdrops but it only came to me several times. Another problem is that in most cases, tokens are given less than $1 and can not be withdrawn and sold, it's pointless. But sometimes you can get tokens, the total cost of about $5-8 then they can be sold, but it's a little money for many people.