People could fix each other’s intentionally introduced bugs and make a living that way.
The argument is less convincing when the bugs are a couple years old. There could be an exemption for that, but it’s also more work to verify (Git histories can be fabricated).
I'm just saying they've got a bug bounty program but not a bug prevention bounty program, or even a fix a known bug bounty program. The security team has a budget for the realized risks but predictably not for managing unrealized risk in the open source community which they depend on.