My opinion, copyright has mattered very little in the corporate world. Copyright is effectively meaningless with SaaS, and the compiled software ran on your machine is protected more by technical controls and EULAs. A world where copyright didn't exist for software would look nearly the same for the commercial world. Trade secrets, NDAs, and employment contracts bind workers more than copyright. The only thing that the question of copyright has real world impact is open source, but even then only for more restrictive licenses such as gpl.
What is being licensed by the End User License Agreement (EULA) is the copyright on the code and its artefacts (executable bytes, etc.) - you can't have an EULA without having the copyright to license.
Plus companies just violate GPL everywhere billions of times with impunity (see: every phone ever) and nothing happens to them.