People choose cryptocurrency because it is very simple way to earn money without any investment in sector of airdrops and social media. It is latest and digital technology of 21st century. Nowadays maximum peoples like cashless technology. In cryptocurrency no limit of work.
This is not the main reason why everyone is coming to the crypto space to choose cryptocurrency. You might say that is your own personal reason. There other reasons involved than just participating in bounty and airdrop.
You need to study what blockchain is about and understand the concept behind it. It is a technology that holds a lot of benefit for now and the future. Most especially when it comes to financial system and the storage of data.