The way I see it: other manufacturers haven't previously had the luxury of being able to do long term testing of their vehicles fully indoors because of the health concerns of the employees working in such a facility. GM could have done it with the Bolt (and likewise Nissan with LEAF, Mitsubishi with i-Miev, etc) but they're all traditional automakers stuck in a legacy mindset so it may not have even occurred to them to bother trying to keep them under wraps like that. They're so used to needing to test outdoors where spy shots are possible that they just accept it as part of the equation. Additionally: the others haven't had the autonomous driving and charging tech to be able to just set up a warehouse with a fleet of cars and superchargers and let it go for a month and see what happens.
SP action is getting interesting: looks like maybe the shorts are running out of ammo?
@vgrinshpun? Certainly appears their pressure is losing the battle to the buying pressure for the time being.