Hey @Sheldon, thanks for your question and your concern.
QuickBox is a Free open-source professional-grade dashboard. What you see with the subdomain on the index page is really just a statement 'It's YOUR QuickBox' and not an actual point-of-sale... as we are not selling anything and QuickBox is entirely self-hosted... we provide no servers as our commitment is too great to the Project itself
As per connections to QuickBox, we value the security of your server as well as the privacy of anyone using QuickBox and as such there are zero callbacks to this site or anywhere else (outside the bounds of needing a service to function). The code is entirely open for review and we encourage everyone to check it out and to always know exactly what they are installing on their servers. I will say however, there is only one ping out from the box and that is with the repo structure that gets installed on your hardware, this is only to connect to the QuickBox Github repositories to perform updates effortlessly from your dashboard.