Ah...this was done for good reason. I don't want to sound like an alarmist over this issue, but it's theoretically possible for spying to be happening without DJI knowing about it...which I very much doubt. It's theoretically very easy for an intel service like the chinese who strong arm anyone from china to do their dirty work. I have some personal experience in this. Getting back to the issue that could DJI data be used to spy...well, as I said, if indeed flight data can be extracted whether in real time or afterwards, not a big deal to link the co-ords to some database of interest. So for example, the chinese are interested in an infrastructure target...let's say the Hoover dam. They could program to flag any data from any source around a radius to it. The key in intel is to flag what is of interest and ignore the vast amount of data that is not. Given the advanced algorithms for searching and matching such things, it's not too difficult to imagine. Yes, they do have satellite imagery, but they may have other reasons for closer views and different angles of infrastructure. Not long ago, the military also banned taking pictures at active bases overseas and posting them on facebook etc...simply because if the geo info wasn't taken off the photo then potentially, that info could be gleaned and the co-ordinates turned into targeting information. It's happened. If you don't want to know where you live, make sure you remove any geo info from photo's you take.
I really don't mean to sound paranoid about this stuff, but if you are concerned about personal info it is something to consider. Going back to DJI, time will tell if indeed they are as trustworthy as they claim to be. Seeing how they handle customers, I'm not so sure they are as honest as they claim to be. Regardless, my 2 cents worth.