That's convenient for the people it doesn't affect. Not only do you not have to worry about the policies: by choosing not to be racist, you absolve yourself of blame or privilege for benefiting from them.
It also depends on you being able to infer another person's intentions. Intentional racists have always been in favour of covert racism in the form palatable policies that indirectly harm the groups they dislike and have always benefited from the unintentional bias of others.
Models are models, not a representation of reality. As long as the model is close enough to the local maximum that the providers keep making money, it keeps existing. And history suggests lenders are not perfect at calculating diversified risk.
The only assumption that OP made is that cheap credit makes it easier to make money, and that makes it easier to get cheap credit. That's not especially controversial.