Stories of these companies listening through everybody’s mics are like modern day ghost stories. It definitely totally happens every single day but nobody ever manages to get a piece of hard evidence. Maybe the algorithms can sense wireshark like ghosts sense cameras
Meta / Instagram / Facebook definitely does this, they even hack your phone to get even more data.
Yes, it sounds like a conspiracy theory. But maybe our phones really are listening to us

Big brands already know far too much about us. But Cox Media Group’s ‘Active Listening’ software adds a whole new layer of creepiness, writes Arwa Mahdawi

The Guardian
Neither of those articles has any evidence of them secretly listening through everybody’s microphone
I linked the second one because, I think, if they resort to hacking devices, they have no problems with recording you. Your voice doesn’t even have to be transmitted to them, they can just analyze it on your device and use their system services which come preinstalled on every android device to distribute it locally.