after some research it seems like Ethniki is getting directions for internal policy by HSBC bank, since I don't believe in coincidences but still I am to lazy to seach for the connection probably HSBC owns over 50% of Ethnikis bank shares. It is to much of coincidence to make the same announcement the same day.

But any who I can't imagine how a bank can affect crypto in general. We are build to survive when they collapse and that is a good thing.