how such thieves can be stopped and the money be restored to the owner??? are the exchanges safe or not???

According to BlockBeats, a theft involving approximately 3.047 million USDC occurred on the Ethereum network. The incident was disclosed by ZachXBT, revealing that the unknown victim's funds were stolen and subsequently converted into ETH by the attacker. The converted funds were then swiftly deposited into Tornado. The address associated with the theft is 0xf0a6c5b65a81f0e8ddb2d14e2edcf7d10c928020.