About half of those profits were from the Optum side of the business, not from insurance.

If you’ve had UHC you’d know very well that Optum is intimately tied to their insurance business. UHC just “administers the plan” while Optum controls plan decisions. So when there’s a problem, which there always is with every claim more complicated than a PCP visit, you get bounced between both companies for hours until you find someone willing to take responsibility for answering questions.