Webflow bills for templates whenever a site is created from one. This also happens when you try to clone a Template-based site, or even to restore a Template-based site from a backup.
All of this makes backup/restore and working with client site variations impossible, without buying multiple copies of the same template for the same project.
This also means designers can't try out a template to see if it will work for their needs, before committing to it.
SOLUTION-
Template billing should happen instead at the point a site is published.
Designers freely create new sites from Templates
Editing, etc allowed freely
No publishing or export until the template is paid
Ideally, Template licenses are tracked in the account, and assigned at publishing, so that I can unpublish Client site variation A, and then publish variation B in its place, while transferring the template license over.