Obviously I don't consider self-hosted runners to be "GitHub's resources". However those are not widely used by open-source projects and are not mentioned in the blog post, so I don't think that's what the concern is about. I don't think ignoring this minor use-case makes this a "knee-jerk reaction", but name-calling is always appreciated...

I don't see how secrets help with mining cryptocurrency either.

Thanks for your comment I guess?