Malware creators use this to hide malicious executable files, making them hard to detect until the very last layer is extracted. The Metaphor: Digital Complexity
Security software, like antivirus engines, often has limits on how deep it can scan within a compressed file to save processing power. A five-layer deep 7z file can easily bypass scanners that only look at the first two layers. Russian.Dolls.7z
Keeping nested file structures perfectly intact across different operating systems. The Bad: A Nightmare for Security Malware creators use this to hide malicious executable