MarsSeed [1] filed a deletion request for lib32-libusb0 [2]: Unneeded foreign binary package in disguise. There's a proper AUR/lib32-libusb-compat package for the same purpose. Nothing depends specifically on 'lib32-libusb0'.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-libusb0/
