Because the price of DIA has gone up many times compared to its original price. Thus bounty hunter received a large sum of money coming from it. The DIA's initial budget is only $ 5,000 so only a handful of people are involved in this campaign
According to what DIA telegram admin say, all the listings of DIA tokens on hoo, biki, hotbit, uniswap and others were not made by them. Team says that tokens are locked till August 18. Bounty hunters haven't received tokens yet.
Probably early investors made this pump, or fake tokens are traded on these exchange (or some sort of "future" tokens). Or the team lies about not transferring tokens to uniswap (where all trade started).
It is too early for the bounty hunters to receive their tokens, as scheduled the bounty will be distributed in three phases. And the first period is 30 days after the bounty ends. So they need to wait until September to receive their tokens