The custom thing started from basically the beginning of eu, this wasn't done in the last decades, but the customs chargers for outside stuff have been increased by the EU. The large corporations are not reall accountable, Volkswagen screwed up, americans got buyback programms, hyundai/kia screwed up, americans got gas cards... intel scews up (spectre, no hyperthreading to keep safe), europeans get nothing. And yes, there are border checks within EU, just had to show my ID yesterday on the slovenia-austria border.