If that's what you choose to make of it, then that's on you. But, patient contact is more than just starting IVs, etc. An EMS skillset involves taking vitals, visual/verbal/physical assessment, and simple patient interaction. These patients go in the back of an ambulance because that is the help they need. If you choose to not see that and to not treat that as EMS then that is you imposing too narrow and simple of an EMS worldview on what private ambulances do.
Like I said above, your definition is far too limited. And sure, I will get offended. You're basically slapping every person who works IFT in the face and telling them they are not EMS because they don't run 911. Never mind the fact that most probably do anyways, and that the majority of 911 calls are no different than IFT calls. And no, responding as the first medical contact for a patient in the field is not the crux of EMS. Providing care is the crux of EMS, whether you are first on scene, last on scene, or a link in the chain.
Again, IFT does the same thing. They are providing care of some type, along with a transport to either a medical facility for further treatment or to a home so they can continue with their life. Being the entry into the medical system is no different than being the middle, or the exit, you're just a part of the chain, same as everyone else.
They also use EMS skills, make patient contact, and provide care of some type, but you do seem to be selective in your application of EMS so none of that probably matters to you.