It can only recognize certain hotwords on its own, eg, Alexa. So its not recording 24/7 but it is listening 24/7 for hotwords. They could push additional words and start recording whenever they hear it.
Honestly, they can just send the keywords. No need to send audio if they can match 1000 or so words that are most meaningful to advertisers and send counts of those.
It can only recognize certain hotwords on its own, eg, Alexa. So its not recording 24/7 but it is listening 24/7 for hotwords. They could push additional words and start recording whenever they hear it.
Honestly, they can just send the keywords. No need to send audio if they can match 1000 or so words that are most meaningful to advertisers and send counts of those.
AFAIK this is only speculated, not proven.