Do airplanes usually spontaneously explode? I'd agree "Crash" would be a aweful name, but "Boom Supersonic" makes a lot of sense since most people know what kind of sound gets made once you reach supersonic speeds, while I don't remember any exploding planes really, but my memory has been off before.
Well most aeroplanes don't spontaneously explode, but the Boom's immediate progenitor Concorde is famous for having done exactly that in Paris upon takeoff. And that was the end of that.
Sonic booms are a continuous wavefront, not caused only once upon crossing the "supersonic speed barrier", but radiating outward continuously from the aircraft (or rather a compression point in front of the aircraft) as it travels. Everyone under the flight path of a supersonic craft gets to hear the boom as it passes over them, even though it is "already" supersonic.
it's a perfectly fine name for attracting media attention and VC dollars. in a few years they'll sell their IP to boeing or airbus and the name will go away.
I think NotBoom might be better.