Apple certainly is in a position to do this, and I certainly want to believe that they did - so I think I will.Im more worried about someone inserting unwanted logic inside a chip. Seems like in principle that could be hard to detect via testing.
True, hard to detect. Before I retired, I worked as an IT senior systems engineer. Several decades ago, I wrote custom machine code for IBM mainframes I maintained at my job that controlled the flow of thousands of programs that ran. I secretly embedded code that gave my programs top priority over everything else running. Many years after I left that department, my code was still running and no one detected it (despite a dozen other engineers working on the systems code). And no one would unless specifically testing with the trigger code I used to enable it. Lots of programmers did this sort of stuff for fun, because they could - nothing malicious.
It's different now, with governments doing it for malicious reasons.
“I certainly want to believe that they did - so I think I will. “
Might as well. When it comes to “spy stuff” it’s best to just assume all public knowledge is false. Those that know bever tell.