GPL isn’t the only open source license. This comment is beyond bizarre because it seems to imply that all open source software is GPL? And of course when software is licensed as GPL, that license can be enforced when someone breaks it (like your example). The original comment never mentioned GPL, it was about when something was licensed ss free. So when you give an example where it wasn’t licensed as such, what was the point?
That’s too sensible for the web. It almost makes sense, and there’s no fun compatibility problems to revel in!