It's very simple. They see what's coming with bitcoin, and they don't like it since bitcoin delivers freedom, so they want to launch their own centralized, closed source currency while banning bitcoin so everyone gets trapped in the controlled network of "governmentcoin".
The flip side could be that the NWO actually created bitcoin as a beta test with a large enough international user base to test for security, stablility and scalability.
When the test is complete ban bitcoin then introduce the government controlled version based on the tried and tested technology.