From the FAQ:

    How is Bitcoin used here?

    Bitcoin, in the sense of the digital currency, is not used at all.
    However, the Bitcoin protocol and the implementation of the neat
    idea of block chain is on the basis of twister. The block chain 
    provides a sort of distributed notary service, certifying who owns 
    a given nickname. The name is associated with a specific key pair, 
    which is used for authentication and cryptography.

They're not using this as a marketing scheme! It's also not being used as a crytocurrency, they're merely forking the codebase to use the blockchain in their codebase.