This is an unfortunate side effect of more and more coins using the same address format.
Bittrex gives a very clear warning when depositing:
I acknowledge the following information: By depositing tokens to this address, you agree to our
deposit recovery policy. Depositing tokens to this address other than BCC may result in your funds being lost.
Depositing tokens to this address other than BCC will result in your funds being lost. They require a minimum value of $5000 and a 0.1
BTC fee. I don't get the reason for the minimum value though, if someone is willing to pay 0.1
BTC to recover a lower amount, Bittrex has the same amount of work and gets the same payment.
Long term, I'm curious to see if they ever collect all these coins for themselves. All together, it piles up to an ever increasing amount.