Linux

It was AUR. The way AUR works is that there is a PKGBUILD file that tells pacman how to compile a package from scratch. It can be created in a way where nothing gets compiled, only precompiled binary is downloaded (like from github releases). So it was not a package in purely Arch sense. With those PKGBUILDs out from AUR, malicious binaries only sit on their github, or wherever those were hosted, and are not reachable via alternative package managers (pacman, the official one, doesn't offer AUR at all)