GitHub announced the introduction of a limit of 100,000 repositories for a user account or organization. This limit will take effect on April 28. After surpassing the threshold of 50,000 repositories, the owner will start seeing a warning banner, and an email notification will be sent to the administrator. This change aims to prevent performance degradation for accounts with a very large number of repositories and to exclude their negative impact on infrastructure. If maintaining a very large number of repositories is necessary, it is recommended to distribute them across several organizations.
Source: opennet.ru