Bitcoin failed. J.P. Koning notes in The end of El Salvador’s bitcoin payments experiment: But here was a government that was going to champion the stuff, nullifying all of the headwinds against bitcoin in one stroke! The government meddling hypothesis would be put to test. The Salvadoran government used a combination of sticks and carrots to kick-start adoption. First, let's list the carrots. The capital gains tax on bitcoin was set to zero to remove the hassle of buying stuff with bitcoin...
