Binance has been hacked for a total of $5.6 billion. Tether has frozen $1.6 billion, and USDC has frozen $800 million. There was an insider infiltration. The 7702 authorization required Binance14 to sign itself, and Binance16 transfers were also signed by Binance14 itself. Therefore, the problem lies with Binance's private key or signing service, not a contract vulnerability.