Earlier quoted context omitted.
The problem is that you don't get to opt in and know in advance so you don't say anything confidential over a call. If they gave users a warning then I guess this whole thing wouldn't be blown out of proportion.
How do you sensibly tell a user "we are listening to this conversation"?
“By logging in and encountering this message, you have given us permission to listen to and record your conversations in the past”