This is bigger news than you think.... freaking Pandora's box.
I suspect Bitcoin-24's main bank account was suspended because bitcoin-24 had no account verification process, so anyone obtaining someone elses banking details could launder thru the exchange.
The exchange flew under the radar, probably just assumed it was just another online business, until it recently attracted a massive glut of new account holders, then the large sums of money wanting to enter the account raised a flag. Then when they saw it was a trade exchange they realised it fell short on regulatory matters.
Providing an exchange abides by all the regulations there will be no legal problems, bitcoins are legal to trade in just the same as baseball cards.