AirDrop is a free distribution of tokens. Tokens can be used to promote an entirely new coin, which is not yet available on stock exchanges, and only preliminary sale of tokens is carried out. This is much easier than bounty campaigns, which require more complex actions, for example, bug search, design creation, whitepaper translation into other languages, posts on a personal forum, advertisements on thematic forums and comments. To do this, you must either have certain skills, or untwisted accounts (most often in a bounty environment indicated the minimum number of subscribers) and of course you need to have free time. AirDrop also allows you to profit for the minimum number of actions - you can sell the received tokens immediately after they are released to the stock exchange and exchange them for bitcoin or leave it for a long time.