The answer for this one is quite simple: NOTHING. After joining around 100 airdrops at the beginning of this year, I can say that most of the joined airdoprs did not even send the tokens. This might be becouse the ICO wasn't succesful, the airdrop wasn't legit or it was just for phishing purposes (this is why you never use your main email and the same password all ver again). Those airdrops that paid are useless too: around 50-70% of tokens never get listed anywhere and the rest of them quickly lost the value and now they are sitting in my wallet worth almost nothing. I do not recommend participating in airdops, although some of us might have been more lucky. Please share those stories here too!