I don't think that they'll love to see their coin being delisted to any exchange and getting the refund. That's all that they've got. I don't know much about how long those confirmations will take place for ETC. But they wouldn't set a lot of confirmations if it will bring trouble to their exchange.
It's for the sake of the safety of the deposit.
Ethereum Classic's average block confirmations time is approximately 15 seconds. Binance's required 500 confirmations which is about 2 hours is more than okay. I don't understand why an exchange would set to 595,000 confirmations. That's over 100 days of waiting for the deposit to appear in one's account It's for the sake of the safety of the deposit.
