Most Europeans citizens use euros so they won't get 'scammed' by euronet ARMs, as the only 'scam' there is currency conversion (and fees if you use an 'out of network bank', so I think if you are at Boa it should be fine)
Yah, well. That's also true for the ATMs in Germany, operated by the 'Sparkasse' (usually big red S) or 'Volksbank/Raiffeisenbank' (usually orange/blue signage) when you want to withdraw cash as customer of the 'Cashgroup' (Deutsche-/Post-/Commerz-/Hypo-Vereinsbank). Hm, k, just 4EUR and 80cents. But still...
There are still quite a few countries in Europe that don't use the euro, so conversion is an issue there. And most Euronet ATMs have a high surcharge even when drawing euros from a euro account (this may differ per country and location).