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