Why should it be illegal? Muddy Waters regularly exposes fraudulent companies by finding fraud, taking a position, exposing said fraud, then profiting from the

Why should it be illegal? Muddy Waters regularly exposes fraudulent companies by finding fraud, taking a position, exposing said fraud, then profiting from the correction. I understand that spreading lies should be illegal, but I struggle to understand why disseminating factually accurate information should considered a negative thing.