I think I get what it's saying? It's saying that while your phone isn't directly listening to your conversations in any meaningful way they collect crazy amounts of other data on basically everyone and can piece it together in such a way that they can make some scary accurate guesses as to the kind of ads to serve you based on what their systems have gathered your interests are and where/with whom you spend your time.
I'm not entirely sure. They didn't really seem to present much more than speculation on it.
People: "We're tired of all these 'misunderstood villains' we want unapologetically evil for the sake of evil."
Frieren: "Okay here's monsters that learned to imitate human language and emotion solely to manipulate and kill humans."
The same people: "No! You're wrong! They're just misunderstood and you're doing a genocide!"
Yeah, any media that depicts something human like being an irredeemable monster that the only solution is destruction is inherently tricky because dehumanizing is pretty much always the first step in mass atrocities irl. But my God I've seen so many people tie themselves in knots trying to give the benefit of the doubt to demons in Frieren.