Whether it's an airdrop or an ICO, it all comes down to use case. If it's not bringing something to the community, it will eventually be destroyed, and all the blame should be on the developers.

Airdrop participants will do the things you asked them to, promote your project, and test your platform; however, everything depends on the developers' roadmap and whitepaper.

It's easy to build a community of promoters now because of airdrops, but that's all they can do: support and promote your project. For the project to go further, it's in the hands of the developers.