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Three million malware-infected smart toothbrushes used in Swiss DDoS attacks
(www.tomshardware.com)
Rules:
Act like a nice human being.
So you can access your brushing habit data via a convenient app and the company can sell your brushing habits data as well as any information that can be gathered about you, anything on your Wi-Fi network, and phone thanks to the app.
There is no genuine consumer advantage to most smart tech.