The search for anonymity, which is one of the main attractions for the use of certain cryptocurrencies, is constantly fought, including by the tax authority. When it comes to cryptocurrencies and tax, I didn't know there was a problem? Why should a certain country tax you for crypto profits that aren't regulated by a bank or a specific country?
The regulations put on crypto is usually seen as a good thing because it means governments are seeing bitcoin and crypto as something good but recently there has been too many news where regulations are overdone and it might cripple the market if they are strict like this.
Brazil is not known for best of the corporate regulations and there is absolutely no company I know based in Brazil and globally known (except maybe their soccer players) but even for their standards it is not nice to go after crypto profits when the market is so stagnant, this would only make people get away from crypto game or at least move their business oversees and not follow brazils strict rules. This is not good for crypto for brazillian followers but also bad for brazil to miss out on proper laws that would allow them to make it a crypto haven.