No I have never offered (or been required to provide) aerial footage before but I'm transforming the business into an /out/-centric one so will hopefully be using it as much as possible. I've used the Mavic for non-commercial projects but the quality just isn't quite able to match with my cine camera.
If you wanted to start making money from it you do need an initial investment. Depending on where you live you could be looking at around 3-4k for an entry-level professional craft and tuition/license.
The capacity in which you could find work as a drone op varies massively. You could be going on long shoots with a larger crew carrying all your gear and working with the director/producer in getting all the footage they need, then hand off the rushes to the editor. Or you could be paid by some business to rock up, take some nice shots of their property and cut it into a short video for them. Whatever you want to try and do you need to come at it with industry knowledge and experience. Otherwise every boomer with expendable income would be out there getting drone jobs.