From the 10-K CME’s cash primarily consists of cash on hand and cash deposited in banks and interest-bearing savings accounts.
So:
1) Some of the money is "deposited" in non-interest bearing accounts
2) CCME is a Hong Kong holding company - if it holds money in Hong Kong the rates are in step with US rates these are in the 0.20% range. Savings Rates on China mainland are higher which would be consistent with VISN, a China mainland company, gets a better rate. [1]
It would be nice if company would be more transparent about this matter.