They compare this in the article:

  Platform  | Repos scanned | Verified-live credentials | Per 1K repos
  ----------+---------------+---------------------------+-------------
  Bitbucket |    ~2,600,000 |                     6,212 |         2.39
  GitLab    |    ~5,600,000 |                    17,430 |         3.11
  Gitee     |     7,256,531 |                    26,400 |         3.64