That the real answer is because these countries are just being neutral considering the others are turned hostile about bitcoins. We just need to appreciate those countries that didn't take advantage to implement heavy taxes or totally ban them. Because of them, we feel the growth of bitcoins nowadays and we are not yet into some scenarios where a successful country like Singapore will totally follow El Salvador's footsteps regarding bitcoins. But we are heading towards that future when everything is set.
Have several countries give neutral feedback about bitcoin as legal currency transaction or not, but another country take care with their travelling business, maybe when accepting bitcoin as legal currency transaction get bigger impact with tourist coming. I think Singapore keep neutral with bitcoin because they not in country list for banned bitcoin as legal currency transaction, I sure what did by El Savador when making bitcoin as legal currency transaction make Singapore want to give opportunity for bitcoin how could develop and help their economic country. Have bigger impact later what most success country like Singapore adopting bitcoin as legal currency transaction at the future.