Do I have to refilter strings from datastore everytime?

Many games will store text using Data Stores. For example, games may store a chat log, or a player’s pet name, etc. In such cases, if the text that is being stored needs to be filtered, it is recommended to filter when retrieving the text. This ensures that the most up-to-date version of the filter is being used. (Source)

Is this required or is it just recommended? Can I not just post the filtered text into the datastore and never filter again?