It seems to me that many bounty hunters familiar with the project will actively participate in it as investors. Conversely, investors wishing to receive an additional bonus will participate in the bounty campaign.
This algorithm is common to all popular projects. In any case, all parties get what they want, so this is an advantageous cooperation.
You are right, the project allows you to earn in many ways. Even if you do not have the money to invest, you have the opportunity to take part in a bounty campaign.