What strikes me about these IOT devices is that their value doesn't just go down as they get old/outdated/unsupported, but they can easily become a negative val

What strikes me about these IOT devices is that their value doesn't just go down as they get old/outdated/unsupported, but they can easily become a negative value that far exceeds the original price paid. That is fairly unique (almost unknown in any simple physical device) and requires a very different purchasing/disposal/return policy.