Though SteamUnlocked has never been caught with malware themselves, they do upload games from IGG, who have a very bad reputation within the community for things like adding their own DRM to games, and doxxing a member of another site. SteamUnlocked seems to scan all files they upload, so we feel as though they're safe, but we still felt it was only fair to at least give a warning about IGG due to their bad reputation.