Its technically not tax evasion until they don't pay taxes on it, right? All they did was usurp people who were already cheating. If they were really concerned

Its technically not tax evasion until they don't pay taxes on it, right? All they did was usurp people who were already cheating. If they were really concerned about tax evasion and money laundering, the feds could've just opened a case, assigned a few agents to it and then waited. They knew who did it, how they did it and still went after them before any real crime had been committed.