PSD2 is just MFA, it doesn't prevent shady companies still asking your login credentials, even if you must authorize that login from your official banking app. Klarna is one of many examples - they ask me for my bank credentials on their own website so they can crawl all my finance data .
Plaid and Finicity do this in the USA for some linking of banking to other financial products. Feels SO insecure. Connecting my credit union checking account through Plaid even ironically brought me to a login page which explicitly states I should never give my banking password to any other entity.
If I need to link my accounts and these services are the only choice then I change my banking passwords immediately after.
Plaid whole business model is that it uses OAuth2 on banks that support it and export the data through APIs; and for the banks that don't, they ask for name/password and scrape it through "fake" web browser that mimick user behavior on the backend.
(I worked for a Plaid competitor. The long-term goal for all similar companies is of course to use OAuth and APIs, because it breaks less often; but since the banks don't offer that, scraping it is!)
I have a Klarna account I opened when their flex account rate was amongst the best you could get and I don't remember them ever asking for my bank credential.
I think Bankin' used to before PSD2 and to get a bit more information from some banks but then again Bankin' is a financial agreggator whose explicit purpose is crawling your banking data so it's not too surprising to see them asking for your credentials.
