There are three sources of profit for insurance companies: 1, the difference between the expected compensation amount and the actual compensation amount in the insurance clauses; 2 spread, that is, the difference between the pre-determined interest rate in the insurance clause and the actual investment income of the insurance company; 3. The difference between expenses and income, that is, the difference between the expenses scheduled in the insurance clauses and the actual expenses incurred by the insurance company.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.