Group permissions and ownership

The documentation for group permissions is really scarce at the moment so I’m trying to understand how this works experimentally, but I’m not making much progress.

What’s the purpose of a group’s owner_id ? I created some groups using the API, and their owner_id is set to myself. I don’t have access to create projects in these groups. OTOH, groups created on the web UI don’t have a owner_id set.

When I create a project using the API shouldn’t I be the group’s owner?