That's a funny idea. "Hiring" people to check airdrop applicants.
The best way imo is to connect multiple accounts so that you can't apply with your 389 BCT alt accounts. Telegram needs a phone number, for example. Most people have only one number and one Telegram account so that would reduce the abuse.
DeepOnion is a good example of having strict screening for multiple accounts, they hire mods to check participants before airdrop #16.
Having a telegram account is a good suggestion to prevent multiple users to register for the airdrop. most cheaters will surely not bother to buy or get a a new number just to register for the airdrop.