One of the major advantages of free software is that the community protects users from malicious software. Now Ubuntu GNU/Linux has become a counterexample. What should we do?
Proprietary software is associated with malicious treatment of the user: surveillance code, digital handcuffs (DRM or Digital Restrictions Management) to restrict users, and back doors that can do nasty things under remote control. Programs that do any of these things are malware and should be treated as such.