So basically what you call to be the airdrop is just something to get your users verify how much they have donated you? I mean if I wish to join the airdrop it seems like I have to donate, therefore it is not an airdrop as it is not freely distributed...
Oh, definitely not. The donation part is optional but definitely not required to participate. There are already a dozen people registred with no donations by them. 100 people can participate and acquire EXIRE without donations.