The word intermediary gets used as an insult in this market, which obscures a simpler question: does the party in the middle work for the seller or not.
A licensed broker is an intermediary who represents the policyowner and is a fiduciary to them. A marketing company is an intermediary who represents neither side and is typically paid by the company it refers to. Both sit in the middle. Only one of them has a legal duty to the person selling the policy.
That is the distinction this directory exists to draw, and it is why every entry carries a role label. The companies that buy life insurance policies list separates the companies that buy, the companies that represent sellers, and the companies that pass cases along.