My bank uses 6 digit ‘customer number’ (which is set by the bank) and that’s verified with an app and a personal PIN (app shows ‘login attempt ABCD at mm.dd. hh:mm’ where ABCD is shown on login page too) or via SMS OTP (again with ‘ABCD’ verification). And again with personal pin + app or OTP to confirm transactions. The app itself can be protected with a fingerprint or phone pin and every new installation needs to be registered to the system, so I can’t just use my phone app to access my wifes account (or anyone elses) but I still can map multiple accounts (like corporate ones) to the same installation.
I think that’s pretty reasonable approach.
Väki also means (or at least used to) ‘power’ or ‘strong’ (väkivahva, väkijuoma…) and that’s also where the etymology for ‘väkivalta’ comes from. So it’s got nothing to do with people.