Thanks for your lengthy response, I'm very interested in understanding this topic. I don't actually remember the Macri tax amnesty, since I arrived in Argentina in late 2017, so I did what any engineer would do, and I started searching. I came up with this, I don't know if you'd consider it a credible analysis (and I'm impressed that Argentina's tax policies provide so much fodder for academics to chew over), but at first sight it does seem to be a serious heavyweight publication:
https://shs.hal.science/halshs-04103653/document
I'm still reading it, but right at the start it sets the context, saying "Argentines today [2022] report that nearly one-half of all their assets are offshore". and it does eulogise the Macri amnesty program, saying "We leverage rich policy variation from Argentina, which implemented the world’s most successful program".
This, however, is the critical paragraph: we "find suggestive evidence that
Argentine taxpayers do not repatriate their offshore assets, despite sizable tax incentives for repatriation. First, we find little evidence that repatriation clauses, often included in tax amnesties, entice evaders to bring capital back into the country. Instead, most
Argentine evaders chose to pay heavier taxes and keep their assets abroad. The lack of repatriation response is surprising in light of Argentina’s recent move to impose higher taxes on foreign assets. These results suggest that tax incentives do not explain why Argentines have offshore assets. Instead, we posit that
wealthy Argentines keep their wealth abroad to insure themselves against economic volatility, currency controls, high exchange rate fluctuations, and inflation spells, and to obtain higher returns".
And they go on to quantify how much actually came back: "Participants revealed assets worth US$117 billion, representing 21% of Argentina’s GDP in 2016. The success of Argentina’s amnesty surprised even the authorities themselves. [...]
The penalties raised US$9.5 billion in revenue equivalent to 1.8% of GDP (AFIP, 2017). These numbers suggest that Argentina’s 2016 amnesty program is
one of the world’s most successful tax amnesties in the sheer value of the amount disclosed and the revenue collected from penalties".
USD 9.5 billion is certainly "billions and billions" from where I'm standing
but nowhere near enough to finance a dollarization program. Argentinians just preferred to pay higher taxes, legitimise their foreign assets, and keep them out of the Argentinian banking system. Somebody needs to think again...