Also I remember ARJ and PKZIP being used legitimately while I can't think of a single time I encountered a rar file in a non piracy context. Actually when I got my first job fixing up desktop computer in a large public institution the presence of winrar was a sure sign that I was better off airgaping the computer immediately, scanning with an offline antivirus and backing up noninfected user data and then reinstall, hoping I would not encounter child porn.