Computing systems across all platforms contain backdoors by default, from package managers like npm and cargo to hardware components. Recent attacks like the Shy Hulude npm worm and XZ backdoor demonstrate how malware spreads through supply chains via phishing, post-install scripts, and compromised dependencies. Governments, corporations, and criminals actively plant backdoors in software, networking equipment, and processors. Protection requires behavioral changes: avoiding phishing, locking dependency versions, using application firewalls, slowing down development practices, and improving fundamental knowledge rather than relying solely on technical solutions.