MoroS [1] filed a deletion request for electron-bin [2]:
Now that electron is in the community repository there's no longer any
reason to keep this package. It only did repackage the official
binaries and community/electron does an even better job of providing
them. All AUR dependencies on this package have already switched to
electron.
[1] https://aur.archlinux.org/account/MoroS/
[2] https://aur.archlinux.org/pkgbase/electron-bin/