I think it is good news because this means that now there is a tendency to use more btc and this will lead to the necessity to change the current currency to the digital one forever and Thailand will take part in this
The more people who will be engaged in bitcoin means increase in the demand and increase in the demand leads to high price. Its legalization will surely affect the price of bitcoin in a good way. Hope that more and more country will acknowledge this revolutionary technology.
The legalization will add usage for this system and it's a good news not only for the people from Thailand but also for crypto followers who knows how to play well with their investment, imagine travelling to Thailand just bringing your device and you can do transactions paying your bill using this crypto currency eventually the world will work with paperless money we just need to support this system.