Did you read your own article? It says: "Voter fraud, by any method, is still rare. A study by News21 — a consortium of journalism schools — found 867 cases since 2000 in which someone had admitted guilt or been convicted of a voter-fraud offense. That was out of about 146 million registered voters."

The headline is super misleading, the point of the article is that selling votes is more common than outright impersonation or other forms of voting fraud.

In Brazil, voting is compulsory. All those people are going to be voting anyway