When a rich person spends money by suing, they have nothing to loose, only to gain. This reminds me of a former president suing his lawyer who helped him executing his dirty plans.
Years ago, Greenspan sued one of my friends (@WholeMarsBlog on Twitter) out of sheer spite. Greenspan is a well-known Tesla shortseller with a chip on his shoulder. When I saw this headline I just rolled my eyes; this will get thrown out.