According to the standards set by the Ministry of Public Security, you can file a case for investigation if you defraud others of 3,000 yuan. Since we know that Liao used the dating platform to make friends and swindle dozens of people's money, why not jointly report the case to the public security organs? If the situation is true and the total amount of fraud exceeds 3,000 yuan, the public security organ will definitely file a case for fraud.