I've been running infrastructure for a long time. I feel like all of the work is just part of my job, things I do regularly. You could replace git with some other service/software and each has its own requirements and considerations. I would not call my work trivial but running git and lots of other things well is completely reasonable.
The problem is not with the services itself it's more in regards of infrastructure, backups etc. If you run the services yourself there is not a single point of failure as you would have with a SAAS.
Also team considerations. When you add an important moving part (all your devs will complain bitterly when it breaks and their work will be significantly impacted) you need at least 2 people who know how to keep it running at a minimum, and more would be better.
