It's a bank Lithuania https://help.revolut.com/business/help/more/general/is-revolut-a-bank/
Revolut Business is a bank in some regions we operate in, including the EEA (European Economic Area). Revolut Bank UAB holds a full banking license in Lithuania, allowing us to offer cross-border banking services to our business customers in the EEA.
But Revolut Business is not a bank everywhere yet, including in the UK. Revolut Business continues to work towards securing a UK Banking Licence. In the meantime, we offer our UK Customers e-money services, and hold our customer's deposits securely in a third-party licenced bank. Read more about how we safegaurd customer deposits here.
We'll communicate any future changes and updates well in advance to all our customers.
Note Revolut does CRS, Wise currently does not (hence you know the difference between bank and EMI).