Anyone who is in a position to help fund a task put up by users in the community can donate to the public address of the bounty to help incentivize the public to work to complete the task. If you've got the skills to complete a task, whether that's design, development, tracking criminals, or working with a team, you can earn huge amounts of Bitcoin Cash.
Bitcoin Bounty Hunter originally started as a means to catch alleged criminals, assumed to be behind the hacks of well known exchanges. We have since grown the service to include bounties from within the community. Have an idea for a task you'd be willing to put a bounty up for?