Probably wire fraud instead of insider trading.

Virtual currencies might be categorized under (1) currency (like dollar/pound) (2) commodity (coffee/corn) (3) security (stock/bond).  The regulations for these things are all different.  Insider trading is heavily regulated in security market, not as much in commodity and currency market.  So it is kind of hard to charge someone with insider trading in cybercurrency because current law doesn't exactly fit.  

The case raised by LaoMao is charged under wire fraud.  This is easier because these people used interstate wires (internet and phones) to commit fraud because there are communications between them.  

In LZ's case, even he didn't communicate with someone else, as long as he's looking at cyberexchange's trade over the internet and use that information to make money, he might have committed wire fraud.  The database might not be local to LZ's office computer, the data was probably copied over inter-state fiber connections, so it might well be wire fraud.