Over time someone discovered that the number of repositories and usage was much greater than they expected. What they found was that non engineering folks who had contact with engineering had asked questions about how they manage their code, what branches were, and etc. Some friendly engineering teams had explained, then some capable non engineering employees discovered that the server was open to anyone with a login (as far as creating and managing your own repositories) and capable employees had started using it to manage their own files.
The unexpected users mostly used it on a per user basis (not as a team) as the terminology tripped up / slowed down a lot of non engineering folks, but individuals really liked it.
IT panicked and wanted to lock it down but because engineering owned it ... they just didn't care / nothing was done. They were a cool team.