Automated rejection of well-intentioned contributions can discourage potential contributors from engaging with a project.

I get that spam PRs for popular repos are a problem, but nothing turns me off from ever wanting to contribute to your project more than when I get an automated response like this. I was reading your docs. I noticed a typo. As a good open source citizen, I took two minutes to correct the typo and open a tiny, clearly-formatted pull request. Spread the load, many hands make light work, etc. But no, you just told me to get lost. Message received, I won’t try to help your project, I guess. 🤷

I get that spam PRs for popular repos are a problem, but nothing turns me off from ever wanting to contribute to your project more than when I get an automated response like this.