I don't know why people keep thinking that phones are listening in on every conversation just so they can advertise 'Volvo' at you.
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they don't need to - we give them loads of data voluntarily based on location data, what we search for, things we buy, things we 'like' on social media..
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they'd be stung for huge fines and reputational damage if caught doing it.
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it'd take enormous storage and processing power to manage all that data.
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Just think about how many things you talk about every day that you've never then seen an advert for (confirmation bias)
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my Google Home can't understand me when I'm actually talking directly at it asking it a question, so the idea it can seripticiously pick out words while listening through my pocket is implausible.