[yosamino]

How is it "absurd extreme" though ?

Things like Amazon Echo exist and are used for all sorts of purposes, including making purchases and being available for law enforcement.

Gmail is an advertising company who actively listens in on the conversations you have on on their services (i.e. gmail) and uses it to display ads.

Facebook is an advertising company and data mines the hell out of all the data about you they can get their hands on to be able to sell targeted ads.

The specific use-case of "listening to you talk with your mouth, analyzing it and then showing you ads based on it" might not be explicitly be mentioned in the Facebook TOS, but it's the very natural extension of their business model keeping in pace with technology.