Airdrops are now becoming irrelevant, most of them are there to scam people look at ltg they just dump their coin and run away. Be careful
It really depends, I am working on a project and we did think that airdrop could be useful but the issue we see now is that people expect to get rich from it. Thus, often the wrong people join and only damage the entire project
We will probably do more like a bounty and without things like social media and alike. Since it fits the project we are building. Still, given the current situation we are considering postponing everything
Partially it is because 50% of airdrops have "an idea" without even draft of a roadmap. They do airdrop and go to any exchange hoping for who knows what. That spins airdrop as simple way to gain free money.
Problem is how to create airdrop which would collect people interested in project for a long term. Having just form with ether wallet and email address won't do that.