I have heard that the idea here is to “eliminate intermediaries” like the Korean Baduk Association. I have heard that professionals have to pay something like 10% of their tournament prizes to the KBA (in return, KBA provides their infrastructure and pay a basic salary to every pro). For top-level professional players, they pay much more than they receive from KBA. A system where they can arrange matches and payments with sponsors directly leaves out such intermediaries.
That is, I think, the whole point of blockchain: To eliminate intermediaries by building a distributed system. For example for bitcoin and such, the intermediary would be traditional banks. Here, it would be the professional go associations like Nihon Kiin and KBA.