Makes me wonder if an ELO-based system would work to mitigate these issues. People who merged PR successfully onto a project, that had real issues acknowledged, the quality of their responses measured by other users reactions or something, etc, multiplied possibly by the degree of importance of the project where their activity has been made. Won't be about human vs AI, but actual helpful effective being vs low effort…
The problem is you want the ELO score based on work on other community projects - you can't assume good faith here.
There are a lot of political tricks that get used.
What is scary is that one of those kinds of users are malicious state actors. Like North Korea and Russia...