Zsite 5.0+ has verification code settings.

Login backend, go to "Settings"->"Security"->"basic settings"->"frontend list". You can choose "Always", "once sensitive words detected", or "Never" use verification code.

If you choose "Always", go to "Settings"->"Security"->"verification code settings" to add your verification questions and answers. You can delete or add more Q&As.

At the frontend, verification questions will be shuffled and one of them will show randomly. Only the correct answer can get members through and then they can publish content on your website.