Generally, as long as you fly within the FAA’s rules and are respectful of people’s privacy, you should be fine. Check for local restrictions for Public lands but in general seems to be limited to National Parks, Monuments, some State or local areas may have their own restrictions, but really FAA controls airspace. BLM, Forest Lands usually ok unless temporary flight restrictions or nearby airports, FAA has an app to help you find those. I would be careful about posting drone footage without a commercial operators license.
I think they are an invaluable tools for prospecting. Helps you see stream flow before bushwacking in, helps determine the vegetation lines from past mining. Great tool.