Even if you don't know it's a fraud, you can wind up losing the profit. This famously happened in the Madoff ponzi:

https://news.bloomberglaw.com/bankruptcy-law/madoff-investor...

> Investors who profited in good faith from Bernie Madoff’s Ponzi scheme must return millions they received in excess of their principal, the Second Circuit ruled, affirming judgments allowing the firm’s liquidating trustee to claw back the funds.

> Net winners of Madoff’s infamous Ponzi scheme don’t have property or contract rights to profits earned over and above what they invested, even though they were unaware of Madoff’s fraud, the U.S. Court of Appeals for the Second Circuit ruled Thursday.

Wow, that's pretty bad. Not only you take the risk but you are doomed to loose either way.