Arbitrarily denying someone transportation when the are in need of it or when the vehicle is in a dangerous location can be dangerous. Of course the article is a little light on details.
Ridicule by consumers and competitors could do the trick in punishing these idiots.
It isn't arbitrary if the denial is due to the debtor's nonpayment of his just obligations. It is wholly reasonable and entirely just. Anything else is irresponsible freeloading--something libertararians supposedly disdain.