It's bad practice and undermines the idea of decentralization... please think about it if you have your XEL on BitTrex and consider putting it on a private account.
Have a nice weekend!
PS: If the situation keeps like this, I really hope that XEL will be delisted from Bittrex to wash out the Bittrex-Hodlers
i don't understand. How is it possible that more than half of all XEL are owned only by one people? I don't think this is really safe for xel itself..
Half of XEL are not "owned by one people" half of XEL are stored at Bittrex. That's a phenomenon you see with lots and lots of other currencies and nothing unusual. Most buyers don't withdraw their funds onto their wallet, so the exchanges store the majority of coins.