The concept of "opting down" can be understood as a middle ground between opting in and opting out. It may refer to a situation where a customer or subscriber decides to reduce the frequency or type of communications they receive from a company or organization without fully unsubscribing. For instance, a customer might "opt down" by choosing to receive fewer marketing emails or selecting specific categories of content they are interested in while opting out of others. This can be managed via a user preference center.