In China, they compete with each other to get be the cheapest. Here (Bay Area) it feels like the PCB fab and assembly houses have decided to be higher priced because the defense contracts (and FAANG Quick turns) are willing to pay it.
I think your cause and effect is backwards. They target defense and FAANG R&D because there's no way you can compete on price when you have to pay your employees $20-30 an hour and you have to do small batches because you can't compete on price.
The assembly houses have done this, but the American PCB fabrication companies often have a "slow and cheap" service. They definitely optimize for the defense market, though.
