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Or it can be a classic eavesdropping device.

Malicious charger = Trojan horse?

Where do you source your chargers now where you can track the entire supply chain?

Most of my chargers came with the devices, and I assume Apple checks those pretty carefully. I have a couple bricks from Belkin or other well-known brands that have never had issues with security. I don't think most charger companies are at risk for this, but I think the very cheapest ones might. For example, the cheapest TVs are monetized by telemetry because the purchase price alone doesn't make for a sustainable business model. I would think the same thing might happen with chargers.