Bithumb is a good exchange that is providing different benefits to traders but you can't say Super Coin week is airdrop because it depends on Valor Token trading and if wants to participate in this event you need to buy tokens more than 1 time and this is competition and also lucky winners for 100 traders.
this looks like a competition, player who has high trading amount will get the reward
But if you dont get high trading amount, it wouldnt
They just use branding 'airdrop' to get interest. But I think it is different with aidrop concept