What are the criminal charges against Tornado Cash?

Could you please elaborate on the specific criminal charges levied against Tornado Cash? Are these charges related to money laundering, terrorist financing, or other financial crimes? What is the legal basis for these accusations, and how do they align with the functionality and intended use of the cryptocurrency mixing service? Furthermore, has there been any precedent set in similar cases involving cryptocurrency mixers, and what impact could these charges have on the broader cryptocurrency ecosystem?