[yyuugg]

I think most people in America are more wary of foreign sounding voices. If the person on the other end sounds like a good ol boy, they get more trust.

Scammers don't have to sound like a specific person to be helped by software like this.

[Ukv]

That aspect feels to me like "I used to racially profile people on the street to judge risk, but winter clothing now obscures skin color at a distance". There are heuristics that give non-zero information but are harmful to use, with the cost borne by some marginalized group, and I don't see it as a negative for use of such heuristics to be made less feasible. Reducing people's use of accent as a factor would be a positive for the ~1.5B Indians that aren't scammers, for instance.

I think there's also an autonomy argument to be made, if the alternative is to the effect of ensuring that people cannot use tools hide their accent (and particularly if, as above, the intent is so they can be discriminated against based on it). Even though it isn't something we've really been able to do before, I think it's generally a person's own right to modify their voice.