Better than telling people they can't join the airdrop would be to tell them about all the bounties available, and the DeepPoints airdrop which they don't need a minimum of Onions to join.
And the regular giveaways on the main forum, and the weekly Lotto. There are tons of ways for someone to get the 100 Onions, and we should be letting people know about these instead of just saying "Nope. Can't join."

This coin is nothing without people participating. Help people to participate, and we'll all succeed together.