No, Biometric authentication is being done only with the confirmation from the user. For example, only with the confirmation from the user, thumb impression is being used. So there is nothing called violation in privacy.
If you're still looking for a discussion, drop a mail to me. We shall
I think in some existence it violates the right of an individual. when information is used for other purpose (function creep). Without the owners consent.i.e. Data Administrator vending clients’ details to third parties.
Second an impostor can attack the server system to acquire the bio-metric template data to create false or fake Identity to access unauthorized system.
Depending on how it is implemented and use, biometric technologies can be used to protect a person's privacy (for example when it is used to authenticate a user) or to violate a person's privacy (for example in pervasive facial recognition).
One useful framework which can help to reason/debate about specific use cases is the General Data Protection Regulation (https://en.wikipedia.org/wiki/General_Data_Protection_Regulation) and/or the privacy by design principles (https://en.wikipedia.org/wiki/Privacy_by_design)
They certainly violate the principles of Good Design - just ask the FBI.
In 2014, one of their agents had his laptop stolen, which resulted in the exfiltration of the entire biometrics database. The database also contained data belonging to a couple of hundred CIA agents, which caused a lot of embarrassment.
Since they couldn't change the fingerprints of thousands of agents, they returned to username/password, but this was no help at foreign border-crossings, where agents on overseas operations could now be identified.
Even if your database isn't stolen, the data is stored digitised, so it's just as vulnerable to man-in-the-middle attacks as any other system, and the data can be copied, and used in replay attacks.
Forget it - it's all marketing hype and no substance.