Yeah i saw that issue two years ago. It's sad nothing has moved on here, whereas the forgefriends project (ex-fedeproxy, not directly related to forgefed) has been super active in the past year (checkout their monthly reports) in this area of forging interop.
EDIT: someone on that issue summarized the issue pretty well:
> Its really annoying how fragmented gitlab is rightnow. I have a dozen accounts on a dozen instances. This feature combined with oauth login to other instances, would make it like there is one big gitlab we all use!
