In the early Bitcoin days there was [a fella that claimed to be a bank.](https://www.reuters.com/article/bitcoin-fraud-texas-idUSL1N1A7270) Eventually that "bank" was exposed as a Ponzi scheme.
If someone claims to be a bank they should [have a rating on Weiss Ratings](https://weissratings.com/). So if you don't find a rating there, please be sceptical of a claim of being a bank. Also check for spoofing.
Also one of the points of Dash is that you don't need a bank. So if someone tries to re-introduce a bank, they're missing the point.