The Intel backdoor built into every modern Intel CPU that cannot be disabled or removed: The Intel Management Engine that sits at the very lowest level and cannot even be detected. For example, my PC with its 14900K CPU has it and there's nothing I can do about it. If you feel unsettled by this, then you should be as this thing is the perfect spy platform on everything that you do on your computer.
I wonder if AMD CPUs have this "feature". I suspect that they do, but this video doesn't mention AMD at all for some reason.
I wonder if AMD CPUs have this "feature". I suspect that they do, but this video doesn't mention AMD at all for some reason.