More electric vehicle makers are indicating demand has dropped.Rivian Automotive (RIVN -6.08%) shares have been in a free fall recently. That continued today as seemingly bad news from electric vehicle (EV) makers continued to be released. Even though there hasn't any real negative news out of Rivian itself, shares have plunged by more than 50% in the last three months.Today's drop seems to be more of the same. Bigger-picture EV news that implies a continued drop in demand seems to be hitting Rivian particu ...