This is against WP plugin directory rules. Because of this I give you 1 star delete the plugin and report you..! Sorry but open source is open source...! you can have upgraded features but I honestly think WP plugin directory is becoming overwhelmed with people taking advatage of it.
You can buy Starbox without links and subscription from: http://starbox.squirrly.co/product/starbox-the-author-box-for-humans/ or Go to your use profile just switch off "Powered By Starbox" (under the social icons). It has a global effect for all the authors.