[detaro]

fairly well known, also documented in the API: https://docs.github.com/en/rest/reference/users#list-public-...

If you have your system set to automatically use said key other SSH servers you connect to can tie that to your github user, which technically is a privacy leak, but generally not a serious concern. But if you want to keep a github (or other) account private, take care to give it a dedicated key and only have git/SSH use it when connecting to that specific site.