They are just crypto friendly but they are not even close to El Salvador if the subject here is how the country adapting Bitcoin technology. El Salvador definitely fully embraced Bitcoin to the point that there leader invest there country money on it. I think Singapore is just for Bitcoin acceptance same with Vietnam on adapting the use of Bitcoin in there economy.
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.