During investment you spend money in new project, during airdrops you spend your own time in new project.
That is why many people prefer to participate in airdrops to get free tokens.
They risk only their time, but not money.
Participation in airdrops is a good way to get tokens of potential moonshots for free.
It is good that there are platforms that allow to participate in the airdrops of prospective projects and get their tokens for free.