I would loved to have used it in Argentina & Brazil.
I tried to find a way to use Pix as a tourist (I'm from New Zealand). It would have been really super handy in Argentina tourist destinations (lots of Brazilian tourists so Pix accepted). Argentina was so painful for transactions I ended up buying Argentine Pesos using crypto. Argentina missed out on thousands of dollars export income from me because I hated their payment bullshit so much that I just left Argentina and went to Brazil instead (with different shenanigans). Turned out I enjoyed Brazil more too (great people).
I also wanted to use crypto because it is such challenging fun to play with using it for money (versus speculating), plus I wanted to learn how to manage the risks of using crypto (so I was willing to pay spreads and risk losses; since I highly valued educating myself).
One American I met had taken thousands of USD in cash to Argentina because blue dollar exchange rate (cambio / cuevas) to gain much better ARS per USD than other ways to pay as a US tourist. More reliable too (I had a few problems paying by card which sucked).
South American governments charge expensive fees and have crappy exchange rates to withdraw their money from ATMs: foolish foolish foolish dickhead governments. I hated their greed so much I just won't return to Argentina (goodbye 10x - 100x the export income versus the gains they nicked from me). Plus ATM limits to withdrawal well below a couple of hundred NZD (or USD) so I couldn't withdraw enough cash to spend - just damn retarded - print some more ya fools. Result is I'll warn friends against travelling to some South American countries (especially Argentina). Tourists are fickle - treat them fairly and make it easy for them to spend money, or they'll visit a different country that cares about earning export income. New Zealand has heaps of tourists so I know both sides of the equation (Overseas visitor arrivals to New Zealand totalled 3.3 million in the 2024 year; with a population of 5 million).
I really really loved Brazilians - I'd return ASAP if Chilean LATAM airlines didn't dominate costs (USD1600).