non-Private Templates and Power User Portal

When creating a template, you are given an option about whether or not to make the template private.

If you choose not to make your template private, then Everyone is added to the user list in the Permissions tab with a role of UserTemplateBasedVM.

It seems that users having the UserBasedTemplateVM role are allowed to access to the Power User Portal. 

So, creating a non-Private template gives all users access to the PowerUserPortal.