And if you as the developers of that project, where you will get ETH/BTC to pay bounty hunters and airdrop hunters? Do you know what meaning of Initial Coin Offering? Do you know the purpose of ICO project?
ICO Project id Crowdfunding, they collect the fund by sell their tokens and after they get ETH the developers will distribute it for developing that project and usually you can say the distribution of fund at their website.
So, this meaning the developers hold big amount of ETH or BTC or Cash money to make project? If they have it, they will pay in BTC and the project maybe just around 1 month or maybe shorter. Not all project have a big capital amount yo start their project, they can run their project because the investors behind it.
That's nice question, firstly it was my view I shared and secondly I want people to share their views.
Now, let me say, if a project make it clear from the beginning of their bounty campaign they should tell the hunters some percentage based on the amount raised during ICO. The amount must not be too much, paying with bounty really gives more confidence to both investors and bounty hunters. With more strict rules, although hunters earn less.