While most people have access to e-mails, the ones that generally might not are elderly (eyesight, or not raised with it), or low(er) income individuals where it might be too costly (certain protected classes make up a significantly higher proportion of the LMI groups).
For deposits, it does not yet matter, but for lending, I could see potential implications of disparate impact for age, race and ethnicity.
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Integrity. With it, nothing else matters. Without it, nothing else matters.