Comment by hypfer

The whole idea of "counting PRs" as a vanity metric is flawed because vanity metrics are flawed.

I don't think that there is a technical solution to be found here, as the problem is anything but technical.

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A hack/trap:

Comment "Ah yes thanks a lot for the hint :)", then make the changes yourself.

Then see how the person reacts to that.

Hack the grifters. Hack the planet.