Re: 'None of the actors can be taken at face value
Embedding things in the PCB is really, really hard and the PCBs are made in a different facility to the assembly. Firstly it would be really hard to embed something in the substrate and require a completely different process at the facility it was made in. Then It would be totally random where those boards were inserted and they would possibly have to bypass the normal quality checks on arrival. They could only be targeted if multiple people along the supply chain were involved in the conspiracy and being coordinated.