> the authentication mechanism was reading out your own account number in your voice
That's the most suspect part of it to me - even vulnerability to malicious attack like this aside, who would think that's a good idea or going to work well?
What percentage of people could successfully use a voice assistant to make a note of their bank account number the first time? Nevermind have it determine that it was indeed their voice not someone else's.
Ahem.
https://www.theguardian.com/money/2018/sep/22/voice-recognit...
Often you need one type for basic access (see balance), two for an actual transfer, three for say, transferring a million dollars. This may be something that people like Mitnick proved were necessary.