What is the ruling on publishing a person's data online to warn against him due to his failure to adhere to an agreement, and is the correct action to conceal his matter or expose him?

The fundamental principle is the inviolability of Muslims' honor and the obligation to conceal their faults, unless there is an overriding benefit in publicizing them, such as when harm extends to others. If a job is not completed after money has been taken, an excuse should be sought first. If others are harmed by it, then the warning against him should be confined to the area where he conducts his business, and it is not permissible to publish this on the internet unnecessarily, because necessity is judged by its measure.