Some air drops require you to have .1 ETH in your wallet....they say it is to avoid scams or spam. Is there any reason to be suspicious of this? Obviously i never give away my private key and I have a designated encrypted air drop ETH wallet (so I generally keep no ETH in it).
Nothing is suspicious about this unless they didn't require you to give your private key. As long as the private key is safe, them you don't have to worry to anything. This is just their strategy to see if you're not a spam joiner of airdrops, they need a legit wallet for a legit owner of it.