Each of the programs that I worked for charged something like a $2,500 "base fee", plus mileage. One of them itemized equipment and drugs, the others did not. None of them charged anything if we didn't transport, even if we worked the patient at the scene. No transport = no bill. Not that I think it'd be wrong to bill reasonably for services provided at the scene; IME those actually tended to be the calls where you did the most interventions and used the most stuff. All of the programs I worked for billed insurance and would ask the patient to pay something if they were uninsured, but they were also quick to write it off if the patient couldn't pay, rather than harassing and suing them.
The thing is, I don't think this type of thing is unusual at all. Most of the stories aren't quite as outrageous as this one, but it isn't hard at all to find stories in the media about people receiving massive bills - often for short transports that sound like they weren't even remotely clinically necessary - that the company will not discharge and often results in real financial hardship for the family, even bankruptcy in some cases. I don't know how anyone can work for a corporation that does that to people.