Once Russia took the similar stand on cryptocurrency. After long term research they found the blockchain technology to be promising to make the financial infrastructure perfect but they stood against bitcoin. Same seems to be the scenario with Poland banks adopting blockchain technology, and gradually these financial institutions will move towards cryptocurrency usage.
China as well. They know that blockchain technology is the future that's why they really take the time and money on invest on its development, specially around their government infrastructure. We all know that they suddenly make a U-turn on bitcoin ecosystem, however, they stick to blockchain and take advantage of it, just what Poland is doing.