It hurts your career, violates Cisco’s licensing, and can introduce security risks.
By following the legal methods outlined above—specifically using the CML trial or extracting from eBay hardware—you will have clean, modern, high-performance IOS images that allow you to focus on what matters: --- Cisco Ios Image Download For Gns3 Free
GNS3 doesn't run every Cisco image. You generally need one of these three types: Where do I get IOS images? - GNS3 Documentation It hurts your career, violates Cisco’s licensing, and
For networking students, certification candidates, and IT professionals, GNS3 (Graphical Network Simulator-3) is the gold standard for virtual network emulation. Unlike packet tracers, which offer a simplified view of networking, GNS3 allows users to run actual Cisco IOS (Internetwork Operating System) images. This provides a realistic environment to configure routers and switches using the exact same commands used in production environments. - GNS3 Documentation For networking students