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Me too but I still do not know enough about it. So far as I know there are scammy ones and there are great ones; well these scammy ones are not real airdrops, I think.
But I have to admit that there definitely are "easy money" airdrops too - at least what I have heard; eg. you enter your email address, eth public address and join their Telegram group. And the tokens you shall receive are said to be worth at least 100$.
However, in general I agree with you. They are just promoting...
Somehow I am not the biggest fan of it haha - but each to his own I guess. (: