Which of the following is a false statement about active marketing lists?

The statement that active marketing lists are published automatically when created is false. Active marketing lists need to be explicitly published to become visible and ready for use in Dynamics 365 Marketing. When a new marketing list is created, it does not automatically appear in campaigns or other marketing efforts until it is published by the user. This publication process ensures that the marketing lists are vetted and users have control over what lists are made active and available for campaigns.

The other statements are indeed accurate. For example, active marketing lists are not used for subscriptions, as subscriptions pertain to email preferences rather than lists for marketing activities. Moreover, setting a marketing list to "True" is necessary for it to be visible within the system. Lastly, while it’s common for marketing lists to include a range of contacts, those who have opted out should not be part of selections when compliance with data protection regulations is considered.