Who’s “they”? Because it’s not Arch. Arch doesn’t want to have anything to do with AUR, and neither does any of the Arch-derived distros. They’re all perfectly happy taking advantage of it, of course, but not the responsibility.
Where did you got this nonsense from? What do you mean "they are not Arch"? The AUR is managed and operated by the Archlinux team. As the packages are community-driven content, they cannot guarantee and give support, because it is not their package. But they are still managing and supporting the AUR itself.
- https://archlinux.org/news/active-aur-malicious-packages-incident/ from 2026-06-12 is an official message on the main Archlinux website (there is no new post about the current situation).
- from https://archlinux.org/people/package-maintainers/ : Campbell Jones is an AUR Moderator
- from https://archlinux.org/people/support-staff/ : Andrea Denisse Gómez-Martínez is an AUR Packager, Robin Candau is an AUR Moderator