You are saying that so that others do not abuse the idea of the airdrop you have created a tax? Excuse me but I do not understand, good luck.
Yes. We have created it for this reason
If I have to pay it's not called airdrop but ICO 
sorry
sorryYou may say it is this way, but ICO means Initial coin offering. We are not selling coin by coin, the tax is a symbolic ammount.
this is not airdrop. you must change title.
If we follow what airdrop really means it is good the way we have the title.