Not good. They do automatic CRS snitching despite not being required to, therefore leaking your personal and financial information to who-knows-whom:  https://blackcatcard.com/en/legal/crs-fatca.html
Non-bank electronic money institutions are not required to do so. E.g. Transferwise does not: https://transferwise.com/help/17/borderless-account/2932394/borderless-accounts-and-tax