Fraud is prosecuted but not in a generic sense. If you look at the titles of laws grouped under Penal Code §§ 528-539 you will see many specific situations in which fraud becomes criminal. If there is white collar crime involved there is a special enhancement for that at PC§ 186.11. In the criminal context fraud is essentially a form of theft.
As a former civil litigator I can tell you that in most cases where we brought a civil suit for fraud, criminal charges could also have been brought by the DA and sometimes were. Most fraud victims want their money back plus punitive damages which are not available in a criminal action. Having dealt with some criminal white collar frauds I would also say most DAs are a little lost when they venture out into the world of financial misdeeds. Get a good civil litigator to help you.
You should see a lawyer in your locale to fully discuss your situation.
Good luck to you.
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