[arp242]

Why would it be impossible? The only time I ever happened to stumble upon a GPL violation (more than 10 years ago) I explained it and they said "oops, sorry, we'll fix that". Worth a try, no? I don't think it's naïve. The cost of explaining is minimal and you lose very little by trying. Even if the odds of success are low, it's still makes sense to try as the cost of a lawsuit is so much higher both in time and money.

It's also just basic common courtesy IMO to assume someone made an honest mistake even when you suspect they didn't (because sometimes your suspicions are incorrect).