vitaliikuzhdin [1] filed a deletion request for protobuf-go [2]: 'protobuf-go' was replaced by 'protoc-gen-go', and all its dependents switched to it as well.
Also see https://aur.archlinux.org/packages/protobuf-go#comment-877755 [1] https://aur.archlinux.org/account/vitaliikuzhdin/ [2] https://aur.archlinux.org/pkgbase/protobuf-go/