Searching for a "StartIsBack license key" on GitHub will lead you to dozens of repositories claiming to offer free activation via "key generators" (keygens), "cracks," or pre-activated batch scripts. Furthermore, the actual developer does not host their license keys on GitHub.
StartIsBack is a closed-source, paid utility. Genuine license keys are never hosted for free on GitHub. Most repositories using these keywords are designed to deliver: startisback license key github
License keys found in GitHub "Gist" files or text documents are usually: Blacklisted Searching for a "StartIsBack license key" on GitHub