By treating any lies to the customer as criminal fraud.

For some reason misleading investors in a way that causes them to loose money lands you in jail very quickly. You must provide extensive 'inverstment risk' report with the shares you are selling.

But when selling a car or tickets to faulty and deadly airplane, you don't have to inform customers of all the flaws you've discovered.

The lawsuits of Theranos case and Anna Sorokin make it clear that our society has one set of laws for owners of capital, and another one for the plebs.