The Linux kernel has the benefit of a big team of maintainers, and the GitHub integrations with these LLMs make opening these low-effort PRs incredibly trivial on GitHub vs a mailing list

This is a good point. To be fair, I think the Linux kernel teams are currently overwhelmed by LLM-authored security fixes. However, that will taper off eventually as a huge number of security fixes will be fixed in the next 12 months.