That's a scam mate, they're basically getting free promo from you. Fuck that ICO literally forget about ICO's they're so 2017 ...There's an one unnamed project in an ICO stage. They wanna do Airdrop, they let people complete their airdrop bounty (join Telegram, instagram, add email , etc.), save their wallet and send tokens only when they get on the stock exchange. They are afraid of tokens being exchanged on decentralised exchanges like EtherDelta.
I think, Airdrop tokens should be send immediately after you completeo airdrop bounty. Otherwise it makes no sense to me.