I have never ventured into airdrop projects before.  I really don't know how many of the projects you mentioned are quality projects.  As far as I know people fall prey to scams in airdrop projects.  There is no way to tell whether the project will be good or bad by looking at the initial state of the project.  I am always wary of airdrop schemes, there is always a possibility of hijacking of personal information when such scheme is added where there are various documents besides important wallets.  Airdrop projects are suspicious to me so I stay away from them, I prefer to invest in coins like Bitcoin.