I don't know if Airdrops are good for every token, but they can be a useful mechanism to build an early community. There are a lot of airdrops happening now, and the proliferation of airdrop listing sites, though a few communities do it right in my opinion, like the parachute community. If the airdrop brings around actual community and support for the new project, then it's worthwhile. the risk is in getting spammers who just are out there to get free tokens and care little about the actual project's success, just want a 'free lunch'.