Protocol has a 24 eth budget. For me its a good deal for a campaign. It is handled by Bounty Detective which was proven paid all his previous projects. Unfortunately we cant have some LDN tokens and it seem they want to preserve the value of their tokens so they instead pay on ethereum.
you can get their tokens from airdrop, they also hold airdrop managed by bountydetective as well, and the prizes they give are quite good at $ 3 per person, and a referral of $ 0.50 per person, you can check it on twitter airdropDetective
It's a really small amount but it's also still worth to try.
I think OP must also add HOMT as it will be traded in probit exchange site on the first june. I don't know if ludena was creating two airdrop at once. It's interesting.