Betting pink slips

Is there a rule in Fivem GTAv regarding betting pink slips.
had this idea of people using there patron and getting pink slips, that 1 was worth lets say £10, can they then bet there pink slips in a race in the city. if they win they get 2 back, then he can ask the patron owner to credit him off his next patron. is this allowed?

just an idea

You’re not allowed to make money off anything other than tebex, so no