Do you feel that laws on web site content passed in China, Russia, Saudi Arabia, Iran or Vietnam should apply to web sites created or operated by you or posts made by you on line? Would you expect yourself and other global posters and journalists to be bound, for example, by Thailand’s Lese Majeste laws on criticism or comment related to their king?
That doesn't make them subject to the laws of every country. Most legal systems do not accept the standard the German court used and require a more significant physical, legal or economic connection to a country before a website may be subject to its laws.
PGLAF appears to be complying because it wants to win an appeal in German court, which might be compromised by ignoring the ruling of a lower German court. If PGLAF decided to ignore the ruling, there would likely be no consequences.
That's not to mention the countless expats/second language speakers around the world.
Having a German language version of your website/product is by no means equivalent to being subject to the jurisdiction of Germany the country.
Never said that.