From the people I see on job sites the "illegals" also use them. If you think someone will try to cut corner and die young you would be surprised how many don't want to.Right but then you couldn't hire illegal aliens for pennies as young men to use angle grinders on it.
with no capital investments. (that seems to be the California story angle)
They have machines that could do most of the work but those cost $$$$$$ up front.
Granted for final install work they should be using N95, hepa vac, wet cutting whatever.
Plus when you already are illegal you need to blend in, and fly under the radar, and work like a "pro". The one who ignores most of those rules tend to be handy man trying to act like they know everything after watching a youtube video and cut corners everywhere, oh they are very often legal and grew up locally too.