Just a waste of time big chance that you will never receive the coins they did promise , year ago I did try some airdrops but after all I did only receive 20% of the coins. Also noticed that the coins you will receive almost never match the value in $ what it should be worth according to the airdrop information.
Yes, you are right it is completely waste joining in the Airdrops which the company not bothering about to distribute a very little percentage in order to attract people but after listing the coin we don't find any value to the coin distributed by the companies.