Already some platforms have began offering airdrops but that's just a way to lure more people to join their platforms of which most of them are fraudulent and even if you would claim the airdrops you must have undergone a lot of task from them which some of the task are very stressful and complex as sometimes it may be difficult to complete the whole task and even if you complete the tasks you would find it difficult to withdraw your airdrops so every one have to be very careful and watchful and not to expose their wallets all in the name of claiming airdrops.
That's true.
But even Binance, does this thing through their launchpool. It just sounded better than airdrop but it is the same and you have to stake any amount of BNB for you to be rewarded with their tokens.
It's easier and you don't have to do that much task and that's the comfortability that these exchanges offer to their users. Also, you take risk by allowing them to hold your funds in return to have some potential airdrop rewards.