Entities can register to see the source code in a controlled room. In 2024 for example the party União Brasil checked the code.
In 2025 during the official audit 149 entities registered to check the code and attack the machine. Universities, ONGs, political parties, etc.
Please check you facts before posting what you think
Reference: https://www.tse.jus.br/comunicacao/noticias/2025/Dezembro/te...
Some of the attacks performed: https://www.tse.jus.br/eleicoes/arquivos/relatorio-parcial-d...
One thing I agree with you. It would require another big country effort to break it.