I think it is way more likely they just bought imagery from existing sources. There are tons of high res imagery out there that you can purchase. Price is usually determined by how old it is. This seems way more likely than an insurance company hiring a drone operator and going door to door. Secondly, companies never share the details of things like this. Wherever the source, they are unlikely to share it. Companies don't give details because they don't want to fight you. They just want to cancel your account and move on.
That isn't to say this is right.
Do we want insurance companies peering into our backyards from imagery? I don't. Regardless of if it's a drone or not.
I haven’t transferred data over a usb cable in at least a decade. This means nothing to me.