Free market basics would be "this it the current price for your services, would like you like to provide supply at this price?". This is more like your boss telling you to get back to work because it's busy.
Though either way, I'm not sure what bearing that would have on how "free" the market is. Employers in some sense exist to entice you to do things you don't fundamentally "want" to do, by compensating you for it.
They get texts when surge pricing is in effect like above to incentivize them to sign in and drive.