These private firefighters are generally contracted to government agencies. This is the same thing the US government or CALFIRE will do during any Type 1 incident.
The same as a concert promoter hiring off-duty cops.
Ah, I understand that happens, but that's not what I was referring to. I was referring to private homeowners and insurance companies hiring firefighters.
Companies like Rural/Metro, traditionally ambulance/EMS companies, have expanded into private fire, in those places (one notable city is Grants Pass, OR).
https://www.latimes.com/local/lanow/la-me-ln-private-firefig...