It seems like all the brokerages got sold hard on this. I have a friend who did customer support for Fidelity and they also pushed the voice ID thing very hard. I think it was to the point they wouldn't help you until you set it up.
I have had Schwab accounts for over a decade and called them a couple times, and they didn't bug me about it. Would still prefer WebAuthn to log in, however.
Had Fidelity 401k from work I was trying to rollover to a Schwab IRA. Schwab mentioned setting up the voice password thingy, and I declined and had no further problem. Fidelity tried to push it on me before I could talk to anyone. I refused and had to dial 0 several times for it to transfer me to a person. Glad I no longer have a Fidelity account, if Schwab ever tries that BS I'll raise hell with them.
It's actually becoming more common. I'm not sure how many banks have implemented it, but I've called Spectrum about my internet and a "security" feature called Voice ID that lets you verify your identity with your voice was being advertised
In general, financial institutions (such as the many multi-nationals and regionals that use this) don't want to talk about the specific providers they use, so it can be hard to get a comprehensive view of which are using what.
But everyone who is anyone in banking evaluated this provider, for example.
https://amp.theguardian.com/technology/2023/mar/16/voice-sys...