Nothing stopping Tesla team at our car plant from voting union. Could do so tmrw if they wanted. But why pay union dues & give up stock options for nothing? Our safety record is 2X better than when plant was UAW & everybody already gets healthcare. — Elon Musk (@elonmusk) May 21, 2018

According to Tesla, said Bloomberg, the tweet was meant to point out that members of the union who work for other automakers don't receive stock options. Former National Labor Relations Board chair Wilma Liebman said that the tweet could be interpreted differently, however. "The employee is going to hear it as, 'If I vote to unionize, stock options will no longer be an option,'" she told Bloomberg.