Drone pet waste collection

I've noticed an increase in 2 things lately: parks with no garbage bins and neatly tied poo bags discarded on the ground around these parks. This tells me that pet owners are civic minded enough to pickup after their pet, but not willing to haul a bag of shit in their car when they leave. This seems eminently reasonable to me. But that begs the question... who picks up those little bags? From the amount and apparent age of some of the ones I've seen, it appears nobody's doing it.

Now, littering is technically still illegal, and while it seems not to be enforced much, I'm sure none of these pet owners are thrilled with the prospect of getting caught throwing trash on the ground. So, what to do?

I've noticed an increase in a third thing lately as well, and that is residential poop scooping services. I see their trucks EVERYWHERE, which tells me that people are willing to pay to have their pets picked up after. This gave me an idea for a new kind of business that leverages modern technology. I would sell poop bags with a proprietary color scheme (maybe, if it's cheap enough, embedded RFID chips) which can be left anywhere in a public park with sufficient clearance around it for a drone to land, and a couple times a day at scheduled intervals, our drones fly over every public park in the city scanning the ground for our bags and pick them up. We would negotiate an agreement with the city for our bags to be exempted from littering laws in places our drones are permitted to operate.

There are a few possible business models. The service can be paid for with higher upfront purchase cost for the bags, or with a monthly/annual subscription. A cursory search tells me that commercially available drones with up to a 5 lb cargo capacity can have a range of up to 18 miles, which means with just a few trucks serving as mobile drop and recharge stations parked around a city, we could cover a vast area with pretty few resources.