They know how to avoid this, because heavy autos are considered utility vehicles. They'll claim this is bad for the economy because small companies need access to utility vehicles.
Usually, these heavier vehicles also pay higher toll fees on toll roads like in France, Spain, Austria, Italy, etc. In Austria higher engine power vehicles also cost more on a monthly basis, while registration is a 150€ one time fee, monthly insurance and tax can be around 150€ for a 200hp ice vehicle, even just a Ford Fiesta.