Most of these airdrops are focused on Asian and African countries (third-world countries). In these countries, even $100 is a significant amount, and creators of projects like Hamster are looking for such users to promote their projects. It can be a big marketing and a bigger deception.
by downloading some free applications it becomes a hope to earn extra money with a few hundred dollars we are hard to get, but the main goal can go beyond that, there are many projects to make money and that is the reality, in that case it depends on the economy created by the project -the project so that the airdrop hopes to make a lot of money but that is very difficult to happen, and that is something that must be considered to enter the hamster program by making sure this project first is much better.