I think it's an obsolete rule? well correct me if i'm wrong. But airdrops are blatant on bounties section, and I think it's equal to telegram campaign. Does this mean they're going on a loophole? By making airdrops = campaign?
At the moment it looks like basically every ICO is doing a givaway which they erroneously call "airdrop", since they are airdropping just 0.01% of their supply or so, which is what falls under the definition of givaway.