Correction: We (GitHub) do not push data to BigQuery. Ilya's project archives the GitHub public timeline. That data is then uploaded from his archive into BigQuery. The BigQuery project is public, so anyone can use it.
Is there any docs on the github public timeline? I did found http://github.com/timeline which made me guess for http://github.com/timeline.json which works, but is this documented anywhere? Are there parameters? How often does it refresh? Thnx!