Could you describe in more detail how this would work?
I can imagine within a single organization that something like this would work, in the same way that it does already with wikimedia for example.
But there are not really any examples of this happening between organizations.
Unfortunately closing this Phabricator task as no further information has been provided.
@Daniel_Mietchen: After you have provided the information asked for and if this still happens, please set the status of this task back to "Open" via the Add Action... → Change Status dropdown. Thanks!