Google removed the feature because it wasn't heavily used, and its deletion should help save power and speed up browsing as the Chrome browser will no longer need to continually listen for voice commands.
Not even tinfoil. We shouldn't accept it so easily, I bet there will be a company that comes out to detect if your phone is recording and sending out data like that
Welll, there's already apps to see outgoing packets, on Android. You can check the status of the Microphone and use it if needed. And yet, it didn't happen.
Now what I was saying is : if they really wanted to do it, they wouldn't have to cram it in another feature. They could simply add it to the app, without anyone ever knowing about it.