Instead of guessing, you people need to learn to use Wireshark and find out for yourself.
No, they don't just listen all the time with an open mic and just send all audio to the cloud. Anyone in cybersecurity would definitely notice that and sound the alarm. There's probably tens of thousands of people watching what these companies and their tech do all day long.
They can get all the data they need through other means, like trackers. Most of us aren't consciously aware of the metric shitton of bread crumbs we all leave behind on the net.