The unpublish feature simply allows a user to make their account disappear from the front-ends that support this feature, it would be similar to closing your social account on Facebook, this can be useful for a number of scenarios, in cases where a user was victimized and doesn't want their content and interactions visible anymore.

Also, the Apple app store requires the ability for users to terminate their accounts on the app otherwise the app won't pass their publishing criteria, this way any app building on Blurt can use this feature and hopefully be approved by Apple.

It is important to note that under the hood the data is still immutable and will show on non-participating front-ends and on the block explorer.