'Alexa, are you invading my privacy?' – the dark side of our voice assistants

There are more than 100m Alexa-enabled devices in our homes. But are they fun time-savers or the beginning of an Orwellian nightmare

One day in 2017, Alexa went rogue. When Martin Josephson, who lives in London, came home from work, he heard his Amazon Echo Dot voice assistant spitting out fragmentary commands, seemingly based on his previous interactions with the device. It appeared to be regurgitating requests to book train tickets for journeys he had already taken and to record TV shows that he had already watched. Josephson had not said the wake word - "Alexa" - to activate it and nothing he said would stop it. It was, he says, "Kafkaesque".

This was especially interesting because Josephson (not his real name) was a former Amazon employee. Three years earlier, he had volunteered to sit in a room reciting a string of apparently meaningless phrases into a microphone for an undisclosed purpose. Only when Amazon released the Echo in the US in 2014 did he realise what he had been working on. He bought a Dot, the Echo's cheaper, smaller model, after it launched in 2016, and found it useful enough until the day it went haywire. When the Dot's outburst subsided, he unplugged it and deposited it in the bin. "I felt a bit foolish," he says. "Having worked at Amazon, and having seen how they used people's data, I knew I couldn't trust them."