According to feminists from Monash University, smart speakers could be used for surveillance to "protect women against intimate partner violence". (It's unclear why they couldn't protect children or men.)

One in four Australian houses has at least one “smart speaker”. This powerful “always on” surveillance technology offers an unprecedented opportunity to detect and predict events that take place in the home. Patents lodged by Google, and research carried out overseas, suggest that smart speakers could detect screams, shouting and other audio signals associated with intimate partner violence.

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