MarsSeed [1] filed a deletion request for nginx-quiche [2]: This package has been broken for two years, but is now also pointless to keep.
Repo's nginx uses openssl, which has rolled out QUIC support in its v3.2.x release. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/nginx-quiche/