Kodi is quite possibly the best media center software of all time. If you are looking to watch videos or listen to music, the open source solution provides an excellent overall experience. Thanks to its support for "addons," it has the potential to become better all the time. You see, developers can easily add new functionality by writing an addon for the platform. And yes, some addons can be used for piracy, but not all of them are. These addons, such as Exodus and Covenant, are normally added using a repository, which hosts them.
Unfortunately, there can apparently be security issues with repositories when they shut down. For example, when the metalkettle repo ended, the developer deleted its entry on GitHub. This in itself is not a cause for concern, but unfortunately, GitHub's allowance of project names to be recycled is. You see, someone re-registered the metalkettle name, making it possible for nefarious people to potentially serve up malware to Kodi users.
The warning came from the metalkettle developer over on Twitter (who has since deleted his Twitter account too). As you can see below, he warns that devices with the repository installed could be in danger from a security standpoint. If a user was to search that repo, and the new owner of the GitHub name was to share malware, the user could assume it is safe and install it.
We do not know 100 percent if the person that re-registered the metalkettle name on GitHub is planning anything evil, but it is better to be safe than sorry. If you still have the repository installed, you should remove it immediately. Not to mention, if you know someone using Kodi, such as a friend or family member, you should warn them too.