IANAL But transcriptions of calls don't GENERALLY run into the multi-party consent state laws, because the concept of a non-human listening/transcribing a call didn't exist when most of those laws were created. So if the service doesn't keep a copy of the recording (they just transcribe on the fly), then it's probably legal.
That being said, most services do announce themselves in someway to cover the legal grey areas. Plus it's the right thing to do ethically.
How do you know recordings aren’t kept? For “quality control?” And they probably are recorded and cached. Even if for a minute, that violates statutes. Statutes don’t care about some progressive overbroad app.
That being said, most services do announce themselves in someway to cover the legal grey areas. Plus it's the right thing to do ethically.