Transcription can happen from audio on the system channel without a bot in the call, so if the remote user can hear it, a model can convert it to text.

The noises confuse the ASR models, I presume.

Someone could still record audio and manually transcribe it or take notes with a pen and pencil... just sayin'. Some of this just comes down to having to trust the other party.

I do take some issue with my voice almost certainly being used to train models when using certain services.