I find this article:
crex24 Exchange accused of hiding hack from customersCrex24’s members claim that the exchange has not given an explanation for its suspension of more than sixty altcoins. The exchange has also frozen withdrawal and deposit services for many of the platform’s coins.
Also, they have some problems with Htmlcoin, suspicious transaction moved a larger amount of this coin to Hitbtc
However, the anonymous source claims to have identified 1.3 billion Htmlcoins being withdrawn from Crex’s wallet, worth $72,800, on Feb. 12. The funds were sent to cryptocurrency exchange Hitbtc.
If wee looks at some of the previous exit scam exchange strategies, this seems to indicate to the same scenario.