According to their own site, they aren't that at all.
https://www.investor.gov/introduction-investing/investing-ba...
The U. S. Securities and Exchange Commission (SEC) has a three-part mission: Protect investors. Maintain fair, orderly, and efficient markets. Facilitate capital formation.
The main purposes of these laws can be reduced to two common-sense notions:
Companies offering securities for sale to the public must tell the truth about their business, the securities they are selling, and the risks involved in investing in those securities.
Those who sell and trade securities – brokers, dealers, and exchanges – must treat investors fairly and honestly.