I don't know the implications outside of Germany although looking in the Wikipedia article it sounds it's an especially big deal here. If I recall it correctly from a back then mandatory course I did about it, it can even happen for an unpaid parking bill on an empty account.

I'd assume so but probably most legal matters are settled outside of courts. Also looking at it the other way around, it would be pretty silly if creating a GmbH would create immunity. Indeed I doubt it's applied very often but when trying new territory regarding copyright, it's probably worth a consideration that one may still be personally liable.

That said, my point is just that UG/GmbH is overkill in many cases especially if the company isn't making any serious money. You can invent a name, go to the town hall, fill a form so you can do business with it and it's possible to legally receive payments. Founding a GbR is a quite informal thing