People like to tear apart Echos because of the privacy fear a lot of people have around them. But in this case, I'm sure many devices have the same problem. It's just a matter of not wiping the NAND memory and instead just invalidating pages. I'll bet you could get a bunch of Wifi and Netflix credentials by buying up used TVs too (another place where people have privacy fears).
Apple at least gets this right by encrypting everything in memory and then just rotating the key (and I think Android does this now too?). But that is complicated and expensive.
I guess those of us super concerned with privacy either shouldn't sell these devices used, or get a powerful magnet that can cause bit flips (or not buy these in the first place, but good luck living in a modern world without buying a device with NAND memory in it)!
Apple at least gets this right by encrypting everything in memory and then just rotating the key (and I think Android does this now too?). But that is complicated and expensive.
I guess those of us super concerned with privacy either shouldn't sell these devices used, or get a powerful magnet that can cause bit flips (or not buy these in the first place, but good luck living in a modern world without buying a device with NAND memory in it)!