You’re making the assumption that customer product prototypes are the only prototypes produced by 3D printers.
There’s plenty of other more valuable things that are prototyped using 3D printers, such as high end commercial machines, or components that go into those machines.
I suspect that getting hold of STLs from US defence manufacturers would be extremely valuable. Why bother trying to capture a copy of your enemies technology, when they’ll happy just send you all the prototype STLs. Even if it’s not defence, don’t you think access to prototype components from EUV machines from ASML would be crazy valuable to Chinese companies trying to close the gap between Chinese and Western chip fabrication technologies?
I mean, if you want to make your point, yes. But I think it would be logical to assume "US defence manufacturers" wouldn't be using Bambu from the start, regardless of what their track record is.
> I suspect that getting hold of STLs from US defence manufacturers would be extremely valuable
It would be, yes. There’s a reason why Prussia has optional connectivity and the camera can be physically removed and unplugged.