Nigel,Sorry, I have heard that worn out explanation before. I do not know where DJI gets its info but it is not the FAA, possibly in part, but not entirely. Even if arguably they do, it is likely to be very dated information. I have identified several noted airspace issues with the map they use here in the states. No, I have not tried to get them to update it/correct it, as I do not recognize DJI as a controlling authority, here again that is solely the FAA's jurisdiction. In addition, this supposed amusement park example is a perfect example, if it is indeed a NFZ it is likely due to it being a security concern, making it a ROZ. ROZs tend to be temporary, as parks are not always in operation (seasonal) or go out of business etc. which means those ROZs are temporary and typically activated through NOTAM. Therefore, there are ROZs or other restricted airspace that we could actually be flying in because DJI does not show those updates. Because they are a corporation, NOT an airspace control authority for the USA.
I have had this discussion here before. NO I do not wish to fly over a prison, nor the capital, nor an airfield (unless cleared), nor any other place that is unsafe, unwise, or unnecessary. THE complaint is very simple; a foreign corporation has set itself up as a controlling authority for US airspace, period. If I were cleared today to operate from a small limited use airfield by the FAA and airfield ops, I could not. I would have to e-mail some foreigner in another country to ask mother may I, and then wait for them to ask for a note from whomever to prove I was cleared, and then they would decide to unlock that NFZ at some point, maybe. If they do, it is not likely to happen for a day or so at best, from everything I have read from others attempting the same. Even further, if they do it is usually only for 24 hours, while the FAA could be granting a waiver for a month.
In summary, if you are satisfied and happy with added layers of bureaucracy and foreign companies controlling your country’s airspace that is OK with me, I am not and I think it is unnecessarily redundant and controlling of my property internally (meaning I have no say in the matter). With respect to the later, I know of very few corporations that do this, actually I can think of none, but I am sure you or someone can stretch out an example somewhere though I doubt it is truly comparable; I can think of many counter examples where they do not.