They use (or employ, if you prefer) me to cover their work. They call the shots. It's their work and they can cover it however they please. In fact, the firm I work for (mytaxi) uses hackneys and clapped out shiteboxes masquerading as limousines as well as taxis to cover it's work and it is a proponent of P2P rideshare. I don't have the power to sack them - yes, I could leave but I'd be replaced, they'd still have the work and it'd still be covered - but they do have the power to sack me. In fact, as noted above, they made that perfectly clear by email last week.