The banks often use the score by such scoring companies, as those scoring companies have access to all sorts of contracts, bank accounts etc. you have. Wheras you bank only has information provided directly by you.
At least in the US, banks see the full credit report you see, not just a number. Using any of the specific scoring models (FICO X, VantageScore X.0, etc) that are championed by scoring companies or the various US credit bureaus is entirely optional.
The scoring companies can have tremendous impact on your life and often they use completely bullshit factors, like your postal code, where you are punished for living in a "poor" neighbourhood or rewards for living in a "good" niegbourhood.
This is quite a claim. How easy would it be to detect and verify that credit bureaus are using borrowers’ associated addresses substantively in their nationally deployed scoring models? I’d wager a college student with an excel spreadsheet and a one-line mailer could do this in a single semester. Now consider the CFPB auditor, with direct records access. How long would that take?
There is also credible reports of ethnical discrimination, e.g. if your name is not a "white" name.
Again, I respectfully suggest thinking these conspiracies through. Credit reporting agencies are fancy bookies in the end, right? They live and die by the legitimacy of the service they offer. So if one of their scoring models has worse predictive accuracy because it’s evil, few banks will use it. Not even because it’s evil, just because it sucks.
The scoring companies should be obliged to provide full disclourse for how they define a score…
They are. In the US, it’s the Fair Credit Reporting Act. In Germany, I think it’s tied to the EU Credit Servicers Directive.
I don’t enjoy defending credit bureaus of all things but conspiracy theories like the ones you’ve described distract from real systemic injustice and disrupt real collective action.
Edit: changed localized phrasing and content so as to not accidentally come across as disrespectful or dismissive.