See: https://wptavern.com/wordpress-org-strongly-urges-theme-authors-to-switch-to-locally-hosted-webfonts
This is a feature request to let us host webfonts locally with Cornerstone. In the Font Manager let us optionally download our chosen fonts to a local folder and serve them from there for enhanced privacy. The Font Manager could then periodically check for updates for the used fonts and download them automatically to keep locally hosted fonts up to date.