@jacob agreed, they aren't high value for community run open source. Well resourced commercial entities can justify it. The Googles, Apples, and Microsofts have TM bearing Brands and Contractual Obligations to maintain.
Anyone trying to collectively organize bounties for OSS projects (is this what hackerone was doing?) is already on shaky ground if they don't provide expertise based filtering of reports seeking a bounty as part of that so that only actually worthy ones make it through to the volunteers.
At the end of the day, a security bug bounty program is a way to underpay a tiny fraction of gig-workers competing for work. In direct financial competition with their alt-gig-reward system of zero day exploit markets and state sponsored equivalent employers.