Coelacanthus [1] filed an orphan request for metals [2]:

This package doesn't follow licenses section of Package Guideline and
RFC 16. I submitted a comment on AUR but received no response or
update for four months.

https://wiki.archlinux.org/title/PKGBUILD#license
https://gitlab.archlinux.org/archlinux/rfcs/-/blob/master/rfcs/0016-spdx-
license-identifiers.rst

[1] https://aur.archlinux.org/account/Coelacanthus/
[2] https://aur.archlinux.org/pkgbase/metals/