Hi Paulo, as you may have noticed we have the Observer role available in Trello Premium that provides a 'View only' permission for guests added to boards: https://support.atlassian.com/trello/docs/adding-observers-to-boards/.
That being said, the observer role currently prevents the ability to mark checklist items as complete. We have a feature request to provide more controls and granularity in these permissions, and I've passed on your feedback to the team. While I can't provide an ETA, will definitely make sure we pass on your interest in something like this.
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