Protecting the open-source license commons

As a European myself, I look at it simply ...

If I had any copyrights, I would contact a violator and say "we need to fix this". If they engage with me and want to put things right, legal enforcement should be unnecessary.

If on the other hand, they come back with a "sue me" attitude, I'd sue for everything I could get. And I don't see that as conflicting with the ethos of the GPL at all! If they wilfully ignore it, why shouldn't I go for every penny? But if it was accidental, and they are genuine, it would never have got that far.

Cheers,
Wol