Your wife is paying taxes in Europe already, which makes her a European tax resident, so she needs to report any taxable income to European tax agencies which is irrespective of whether she used another country's bank account for cashing out the profits. So if you are intend to sell before 2030 then it should be reported and make sure it is under the tax exception limit.
But you may also need to be aware of gift tax when you transfer assets to your spouse, which differs from one to another countries even in EU, but there are also exempted limits which vary a lot. But if you transfer it as gift if you want to avoid any legal complication,s because your wife can't sell something for $10,000 if she can't provide a source of funds, and that came as a gift from you means you can't avoid the gift tax if there is any.
And Binance reports to EU agencies if it used an EU identity to create an account, and if I am wrong, Binance got a separate one for EU regulations, just like Binance US? So you can't use Binance EU as a Latin American!
To get the actual legal ways to avoid taxes, it's better to consult a Tax advisor who has experience with crypto gains.
Gift taxes between partners are very low in my country. Like 1% or even exempt from taxes under a certain amount. So that is safe.
With regards to tax residency.. In theory she is now a tax resident in my country (EU) because she lives here and works here. She came here 6 years ago and was a student. In all those years she was a tax resident in Brazil, even though she did not work there anymore. But in 2023 she became employed here in Europe. She automatically became a tax resident here and her taxes are automatically deducted from her monthly salary here.
But in the mean time, she has not signed an official declaration of no longer being a tax resident in her home country. I recently read that citizens who are no longer tax residents there can either sign a permanent exit declaration, or a temporary one. We don't know which one applies, because we might move to Brazil in 5 years.
We are not very worried about double taxation because there is a treaty against double taxation between our countries, and we can prove that she is already taxed here.
But if she connects her Binance.com account to her Brazilian bank card, I don't see how Binance would inform European tax agencies. Because Binance only knows her nationality, not her tax residency. And technically she has also not given up tax residency in her home country.