I think no one will send money to get back the worthless tokens. And everyone knows that airdrop is free, if it takes money to participate in airdrop then I believe people will quickly give up it
Well, it is true but there are still some participants who join airdrops who don't know about this especially those newbies who recently join airdrops. Those are the people who will fall to this kind of trick even if we know that airdrop should be free.