MarsSeed [1] filed a deletion request for hangups [2]: Discontinued and terminally broken, as Google has shut down the relevant Hangouts service and its API access points.
Reverse dependency mautrix-hangouts-git is EOL and broken as well (deletion request PRQ#58910). It has been refractored into a new plugin called mautrix-googlechat, available on AUR. [a] [a]: https://aur.archlinux.org/packages/mautrix-googlechat [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/hangups/
