It really could be either. I have zero idea on EU laws and regulations, but there's a good chance that they're aware of an upcoming regulation concerning cryptocurrencies that could make operating their business a lot difficult. But at the same time, it could also be because of them not making enough money. See, I never used that exchange, but remember that cryptocurrency exchanges right now are highly competitive. A new exchange that's ran well and advertised well can easily eat out the userbase of an existing reputable exchange.
I don't believe there has been any actual evidence or legislation that has been ruled for the EU community, the best thing I could find about their rules related to cryptos is this, which isn't much:
In 2015, the Court of Justice of the European Union ruled that exchanges of traditional currency for cryptocurrency should be exempt from VAT.
I don't think there's anything wrong with crypto-currencies in Europe, are they under specific rules/regulation that I am unaware of. There are a heap of exchanges available, with some below:
Eurex
NASDAQ
ICE Futures