Did you read my comment? My entire point was essentially that I don't care. I'm not weighing in on that.

Edit: Though, I take that back now, just because you made such a big assertion, I'll play devil's advocate.

Let's say you were using a drone for surveillance, what kind of range can you get in a drone? Looking around online, it appears that 200 km is considered extreme range for commercial drones, it's hard to find anything greater than that. That said, military drones tend to have much greater range upwards of 1500 km.

On the other hand, I see no maximum range for a pigeon, at all. There's a maximum distance it can travel per day and a maximum distance between landings that will keep it from crossing oceans. But that's it.

Secondly, a drone can be shot down. If spotted it will be targeted. So they're vulnerable. The pigeon on the other hand, if spotted, it will be ignored - because it's a pigeon. It's essentially a perfect stealth platform.

So there are two potential advantages if someone got this to work. There would of course also be drawbacks, and ultimately, who knows if it would turn out to be a viable system. But saying there's "no benefit" is silly.