Call me paranoid, but I don’t see any reason to trust a closed-source application developed by a company whose intention is to profile me and deliver me advertisements to not consider recording at least the locations at which I “picked up” their tones, even if they don’t record any more data than that.

Not to mention the risk of abuse if such a program, having been granted access to the microphone, is compromised by a hacker. When you give privileges to a piece of software, you place a trust in its security. I see no benefit to me, the user, in making such a trust. YMMV.