I'm saying that they have the capability of doing it. And many people are being recorded without knowing it.
Theoretically Google's privacy agreement prevents them from doing it without your permission. But if they went ahead anywhere there would not be any major consequences, and the easiest would be to update the agreement to allow exceptions.
The agreement makes it clear that the recorders do turn into data for Google. Theoretically they took steps to anonymize the recordings, but the next time you see an ad for a retirement home the same month you've been talking about putting your parents into a retirement home you're going to wonder aren't you?