Note that 'None' is the default value displayed for empty custom contact fields.
When the anonymization feature is enabled, each new contact profile, whether imported into TextIt via a spreadsheet or generated when a new contact interacts with one of your channels, is anonymized. No user will be The contact's UUID, groups, language preference and custom fields will still be accessible. By the same token, exported contact and flow information will also be anonymized.
This feature is permanent once an account has been anonymized, and only affects the account in which it's enabled. Parent and child accounts aren't affected.
If this isn't sufficient, we're interested to learn how we might improve this feature to accommodate a broader range of use cases.
Contact us to enable this feature.