always listening devices
Whatever you say can and will be used as a targeted ad against you.
Always listening devices are exactly what they sound like: hardware devices with microphonoes THAT ARE ALWAYS LISTENING TO YOU. This includes "smart speakers" such as Alexa or Google Home and also every smartphones that have "intelligent assistants" like Apple's Siri.
The controversies surrounding always listening devices are:
1) What are your audio recordings really being used for? In particular, will you be served advertising based on the content of your personal conversations? (very creepy) 2) Is anyone from the companies listening to this audio? (also very creepy)
Many people have conspiracy theories about #1. Some of these theories have been debunked, but in some cases, always listening device are using your audio data to target advertising. Facebook (shocking!) is one offender.