This idea is also not a "conspiracy theory" at all. Just look at this patent for an ambient listening system, this is owned by Meta! patents.google.com/patent/US201...
patents.google.com
US20180167677A1 - Broadcast content view analysis based on ambient audio recording
- Google Patents
An online system analyzes broadcast content viewed by individuals in a household. Each individual in the household is associated with a client device on which a software application module is executed...