Doesn't the autobahn have unrestricted sections with no speed limit?
If you get into an accident while going faster than 130km/h which could have been prevented by going the advised speed limit, you may be considered more liable by the courts. I’ve heard that there may be cases where your insurance might not cover you, but I’ve never found proof of that online.
Edit: rephrased “decriminalised” as “not illegal” as per comment.
When I’m in Belgium it knows the speed on the highway is 120 km/h. In France or Denmark 130 km/h. In Germany in an unrestricted section? Whatever I last set it to.