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.
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Societies that do not find work in and of itself "pleasing to God and requisite to Man," tend to be highly corrupt.