I am little bit confused that what airdrops are actually be on this. because you mentioned private and the other thing which isn't clear to me. Can you please tell me that What are private and collective airdrops?
Collective airdrops are meant to deliver for all the participants or the token holders in the ecosystem, independent of the individual activity. Private airdrops are meant to be allocated to individuals or groups of individuals who have made significant amounts of work for the ecosystem. In other words, private airdrops are rewards for those who have participated in the ecosystem development.