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Hundreds of smartphone apps are monitoring users through their microphones
(www.the-independent.com)
This is a most excellent place for technology news and articles.
No they dont , they dont have to. Far easier to get things other ways.
Yes, but also no. You're underestimating advertisers' greed for data.
It's actually trivial nowadays to build a background service like that.
Which would show up in network traffic , which it doesnt. There is no need for it.
You could easily process the audio and filter in on the device and just send the transcribed parts that match your filters for further processing. No need to send a constant audio stream. Eventually it would show up in the battery usage but things like the google song recognition also heavily use the mic and process audio and it doesn't show up as heavy as you would expect.