“What would it mean for your business if you could target potential clients who are actively discussing their need for your services in their day-to-day conversations? No, it's not a Black Mirror episode—it's Voice Data, and CMG has the capabilities to use it to your business advantage.”
No.
Both Android and iOS do enforce permissions against applications that have not been granted explicit access to listen constantly.
For example, the Google Assistant is a privileged app oftentimes; and it is allowed to listen. It does so by listening efficiently for one kind of sound, the hotword “Ok Google”.
Other applications not only have to obtain user permission; but oftentimes that permission is restricted to be only granted “While app is in use”, meaning it’s the app on the screen, notifying the user, in the foreground, or recently opened. This permission prevents most abuses of the microphone unless someone is using an app.