As an EMT if you're A&Ox4, alert to time, place, person and event, you make the choices. You do sign a release so we have proof we didn't abandon you, but you make the choice. If we move you without your approval, it's kidnapping or entrapment (not hit me up law arguers). To do that we either need implied consent (minor no parent, not A&Ox4, or Law Enforcement).
My department, a small rural one with a small tax base which happens to cover a lot of injuries because we have 20 miles of dangerous mountain pass freeway and a ski and mountain bike area, only charge for calls if we transport. I think a transport is around $900. Our minimum transport is 37 miles. We scale it down depending on income and type of event. We're not massive sticklers about it. We're just trying to cover wear and tear on big expensive vehicles for all the non-transports, winter driving, equipment, uniforms, training, etc. Most of our "business" comes from "transients" eg folks who don't live there, eg those skiing, hiking, biking, or driving over the pass.
This is also very much not the norm. But should explain a bit about those who do pay are covering those who don't.
We don't want a chilling effect on calling 911 for precautionary stuff. We'd rather show up 99 times and check people out and let them go than miss the impending cardiac event. And we get those. It's very interesting just how much going over a 4k foot pass stresses people on the edge. Many of our medica calls are people driving to seattle for deeper care and things exacerbating when they get to 4k feet.