There might have been other stuff but the best I could tell from the linked pages: "blocking protection" refers to not giving full owner or mainter permissions

There might have been other stuff but the best I could tell from the linked pages: "blocking protection" refers to not giving full owner or mainter permissions to gitlab instance. Which are the required account levels to allow editing and deleting parts of issues and merge requests and other content. But those account levels also include a bunch of important technical permissions like managing deployment keys, access tokens, branch protection settings, none which should be required for people enforcing CoC. Default Gitlab setup doesn't have roles which would be suitable for community moderators. But it seems like Gitlab Ultimate has support for custom roles which could have solved that issue. No idea if F-Droid is in the Gitlab Open-Source program which gives open source projects access to premium features.