Keep group creation restricted or open to all

Our recommendation is to enable self-service with the proper governance in place, see this Ignite presentation: Embrace Office 365 Groups: Overview and roadmap & blog post: Office 365 Groups at Microsoft Ignite 2017  or this blog post from one of our customer: 

https://medium.com/@smcollier/self-service-in-microsoft-teams-f8a1536167bc

+1 Ricardo Viana. In addition to naming policy, you can use Office 365 Groups expiration policy also to keep check on the unwanted groups.

https://docs.microsoft.com/en-us/azure/active-directory/active-directory-groups-lifecycle-azure-portal

Hi Christian,

Personally, I would let them open to all but with naming policies. https://support.office.com/en-us/article/Office-365-Groups-Naming-Policy-6ceca4d3-cad1-4532-9f0f-d469dfbbb552