A common practice these days is to organise site collection in hub sites. It gives you a great possibility to arrange your content more dynamically than ever before in SharePoint. On specific site type, we are dealing in any SharePoint project, for example, are project sites.
These project workspaces only have a defined start and end date. A site collection like this can be useful for a couple of weeks, to month or in case of long-running projects for years. What to do when the workspace reached his end of life?