Developers can contribute to multiple repositories and to multiple integrations. Additionally, developers can maintain multiple Git registrations with different email addresses.
Therefore, in order to maintain a unique number of contributors, the count is collected per integration, and each contributor is counted by their registered email address; alternatively, if the user did not use a mail, they are counted by their user name. This is similar to the functionality when you run git log.
Because of this, Snyk does not sum the total contributors together for all integrations as this would lead to inaccurate numbers, with some developers being counted more than once.
Developer counts are available on the Usage page. See Usage page details for more information.