I think there should be an opt-in Option for this. When you want that someone contribute code to your repro you can opt-in. I think this would be the best solutions.
Of course I understand that some repro maintainer getting angry because of Spam Pull Requests. But you can also mark them as Spam and they will not count.
For further actions, you may consider blocking this person and/or reporting abuse
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I think there should be an opt-in Option for this. When you want that someone contribute code to your repro you can opt-in. I think this would be the best solutions.
Of course I understand that some repro maintainer getting angry because of Spam Pull Requests. But you can also mark them as Spam and they will not count.