If I am not mistaken the bank accounts of the bitcoin24 were blocked by German and Polish police in the investigation of phishing fraud funds being transferred via bitcoin24 and affiliated bank accounts. Not that bitcoin24 took any place in the phishing operations but more that the phishing scammers used bitcoin24 to transfer their "earnings" via bitcoin. At least that is what friend of mine told me (he have quite some amount in the EUR and BTC blocked in the bitcoin24).
More info to be found for example here: https://twitter.com/Bitcoin24com

If I am mistaken I would be glad for correction or more inside/insight info