What about making side loading require some moderate level of technical sophistication? Like connecting to the phone over usb and having to manually type some long shell commands, or exit vim, or write a compiling c program, or some other layman proof filter to activate installing outside apps. I feel like grandma would be too intmimidated by this (good), making it too frustrating for even the most determine scammer to explain, no matter how desperate they are for her social security checks. Have it be done in the bootloader so you can't follow these instructions while on the phone, and require physical interactivity with the device (can't be automated over usb). Regardless, this policy is an unacceptable infringement on digital freedom by google.
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