Big banks are notoriously shady institutions. Wells Fargo, Chase, B of A, etc. Fortunately these are one of few modern shitty things that are very easy to avoid by working with a credit union.
You can be banned here not only from a single “community” but also from entire instances, which the former would be comparable to a subreddit ban and the latter would be even worse.
In any case you can just spin up a new account on either.