I've worked for companies that do this my entire professional career. They do work all over the US to this day. It's just standard property insurance practice. It'd be dumb to insure a property, for both damage and liability, sight unseen. They send many notifications via mail, automated phone and the worker directly calls before heading over there, no one wants to get shot. It surprises me a bit people don't know about it but, even though I've done work in the industry for decades, I've never see one of the inspectors at my house. I hadn't heard of anyone using drones yet but they've used bulk flyover images taken from planes with special cameras for at least 15 years.