I doubt he flew for 25 consecutive days too, however, I believe it was his intent to use it until the other unit arrived, so I agree with your assessment. I certainly wouldn't do it, but unfortunately, people do. My wife has gal friends the buy a dress to attend a wedding, leave the tag on, and return it afterwards. Same kind of thing and I don't think it's right.
Anyhow, I don't believe the OP wants to read us discussing the ethics of product return, he's more interested in any news of new drone from DJI.
Again it goes to his intent, not his actions. So yes, it sounds like he used the return policy as a free rental. If so, then that is certainly wrong, but we all do wrong things from time to time. A good business plan should always include backup equipment or at least a plan to acquire a loaner somehow, and not through a liberal return policy. Perhaps I should start loaning mine out? Hmmm...
The wedding thing happens ALOT. But the prices they charge simply due to a captive audience for a one time event is ludicrous and invites this kind of behavior. However 2 wrongs don't make a right, greed on one side and theft on the other.
We are in the middle of planning a wedding ourselves, and I can literally see the bank account drain... Fortunately an old co-worker of mine is a photographer and will do the main event and a bit leading up to the ceremony for $100 per hour, and all he is doing is providing the raw files. I told him I will process everything to same money, and my brother and I will shoot other parts of the day as well. So $600 for a good photographer has helped keep costs down. Rentals and dresses and shoes and flowers and table decorations and food and invitations and.... the list goes on. The drone might even make an appearance.