If this flies, we'll have proof that "national defense" has nothing to do with the drone ban.
https://interestingengineering.com/military/hanwha-proposes-us-virginia-submarine-building
If DJI has a patent on it, ordinarily it's not a secret and DJI was likely willing to share the design with accessory makers months before launch. DJI is not in direct competition with MAS and they're not trying to outsell the MAS propeller or...
Uh… it’s going to be with us for at least another 3 years, could be more depending on things. Money talks though, and it also rules the tides of politics.