content: Not all.  There are plenty of things designed to the best of the company’s capability to not have backdoors.  Some of the NXP crypto chips, for example.  They have light sensors on die, temperature sensors, power sensors, and fuses that blow to lock even them out of it once deployed.  They are used in credit cards, and the banks and credit card companies won’t tolerate backdoors. You just generally won’t find it on things designed for end-users.  We protect money, but we don’t protect data.