It can be safely assumed that most peoprietary chips have backdoors used by terrorist "intelligence" agencies such as the NSA and CIA, this one just happened to be discovered.
Backdoor found in ESP32 chips that allow arbitrary memory access and more remotely via Bluetooth
https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
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