Research differences in upgrade outreach
https://app.periscopedata.com/app/gitlab/406972/Version-Upgrade-Rate?widget=8458214&udv=1059380 - based on this chart it looks like there is a slight difference in trend from EE and Ultimate and CE, starter and premium customers.?
This might mean there is a difference in knowledge of either GitLab support options, or actual support of these customers.