Short in what manner? Like they literally borrowed Bitcoin (or stole in the case of billionaire SBF), sold it, and now have a BTC liability on their balance sheet? Or do you mean a short futures position? 

Or are you acknowledging the sad but undeniable fact that many billionaires who are physically short in stature (e.g. Tom Cruise, Whoopi Goldberg) all too frequently don’t own enough Bitcoin?