Seems like free tier limitations does not apply to a public group as top namespace, that contains private subgroups and repositories. This would kind of help a lot!
> Q. Do these changes apply to private projects within a top-level namespace with public visibility? A. User limits are currently applied based on the visibility of the top-level namespace. We will monitor how top-level namespaces with public visibility are using private projects to identify whether any limits on such projects are needed.
Storage limits will apply to both private and public namespaces.