El Salvador's Bitcoin adoption isn't faring well, though. Nothing is transparent there either. There's no public record who manages the government wallets, how much was bought and sold, etc. so it's anyone's guess how much is still there after 2 years that isn't in citizen wallets (for as much as those aren't hacked yet). It's an experiment estimated at most with < 100 million $ equivalent in bitcoin in total, and it has lost more than 1/3rd of its value in the past 2 years according to a recent analysis.
Not sure I'd like to be in the gov'ts shoes trying to explain that to taxpayers who have footed the bill for them purchasing bitcoin... and, it seems to be in the hands of Bitfinex and Tether, that have both been banned from operating in the USA due to fraud? Ouch...
Yes they made waves when they tried. I was tentatively hopeful about that, but it's deflating rapidly.
Well, unless everyone in a country is incentivised to start using it as tender, as you said, it's a non-starter to begin with. You need a government to make that happen because individual citizens and the businesses they are buying from don't want to take the risk of dealing with a volatile coin. El Salvador's also had the advantage of using US dollars as their fiat and not their own independent currency -- I could have seen that spiralling out of control quickly if that was the case.