It's called "Public Usergroups" - In your User Control Panel (User CP) there is a section called "Group Memberships" and admins can specify usergroups which anyone can join... The member joins or leaves the group as they see fit. You can setup the public usergroups to any rights/restrictions as any other usergroup...
If that's what you mean. Otherwise is people buy subscriptions they will also be automatically moved to a usergroup you specify.
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