Binance blacklisted MEXC yesterday.
Withdrawals from Binance to MEXC are being rejected outright.
If you transfer funds from MEXC to Binance, they may be held for a compliance review, and your account could be restricted. In serious cases, it may be closed outright.
Indirect transfers count too. Use an intermediary address to route around it—don't bet on it going undetected.
If you still have funds on MEXC, get them out another way. Don’t send them to Binance.