No question the prep of LMI tax returns at a sanctioned VITA site is a CD service by a bank employee representing the bank. Those volunteers have been trained by the IRS and qualified to prepare returns, again, at an approved VITA site.
I believe your concerns are important. Your bank, preparing tax returns, on its property. I am not at all comfortable with that.
But others may do this and get credit. Let's see what the gurus say.
Societies that do not find work in and of itself "pleasing to God and requisite to Man," tend to be highly corrupt.