@mk @threat @GrapheneOS It is speculation, as are all things security-related, but when mass-produced devices have been backdoored at the hardware level (see: Intel Management Engine or Cisco backdoors for example), any software layered on top is a placebo or maybe a slightly better spy filter than the stock OS.
It's all been pwned, best policy is to just find a faraday bag that works (none of them do lolol) and only use your phone in emergencies, which is anathema to today's world.