That's only true if the service is likely to induce behavior that require such intervention - otherwise it's absolutely ok, for example, to call a public ambula

That's only true if the service is likely to induce behavior that require such intervention - otherwise it's absolutely ok, for example, to call a public ambulance when a taxi customer gets sick, as oposed to arranging private insurance for your customers. There is no proof ridesharing would induce criminality, quite the contrary, it's a much safer alternative to random hitchhiking.