This is beyond what we're talking about though, you're referring to copyright infringement. I'm referring to an open source licensed software that ALLOWS commercial use, the only requirement is attribution.

Your example only makes sense if the company stole the code from a proprietary repo, like a hostile former employee.

All copyleft licenses are built on top of copyright law. That is their one and only enforcement strategy, by design. So we are in fact talking about the very same thing. Here, read: https://sfconservancy.org/blog/2012/feb/01/gpl-enforcement/#...