Most countries that are part of Mercosur DO NOT need a visa for the residency process nor do they have to pay additional fees.
Some European countries, such as Belgium, Liechtenstein, Luxembourg, the Netherlands, and Switzerland, also do not require a visa to start the residency process.
There is a lot of misinformation about the visa issue. Having a 90-day visa-free entry to the country only classifies you as a tourist and not eligible for residency, which is why having accurate information in these cases is crucial.
Regarding visa exemptions, some agreements even have expiration dates. For example, the visa waiver agreements with New Zealand, Australia, and the United States expire on July 15, 2024, which means it will be necessary to apply for a visa upon arrival at the airport.