I've noted that Confluence free plan has no "Page and space permissions". In this case the pages you create are by default public for everyone to see or private only for the team?
See: https://support.atlassian.com/confluence-cloud/docs/learn-about-confluence-cloud-plans/
You can't customise permissions but pages aren't 'public' in the sense of being open to the world: you still need to have one of the 10 user accounts permitted on the free plan
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