It's mostly impossible to measure. You can't just use accounts because one person may be holding many accounts. To measure GINI you need a reliable way to measure WHO owns which accounts.
I used the stats zhoutong published. I wonder if some wallet/exchange published more recent numbers since then.
commonly, the "libertarians" are highly privileged white American males who really have no clue how good they have it. They take America and civilization for granted. As you say, it's not hard to live the libertarian dream in Mogadishu.
To be fair, kleptocracy (Eastern europe here :) is just failure of (cultural) morals. To me, when someone says "neocon/neoliberal", I imagine ruthless robber baron capitalist who truly believes that market is end-all solution to everything, ethics be damned. Surprisingly, significant amount of those "white straight male reddit fedora libertarians who love to shoot guns" appear to not discard basic human decency in their dogma. However truly free markets are in contradiction with that - having no "silly morals" is very effective competetive edge after all.
This cognitive dissonance is my main problem with the ideology, I'd love to hear how one is supposed to address it, short of brainwashing people who are supposed to think for themselves with christian values.