You can self host GitLab. But that is a minor point. I'm only speculating on why people may not just start using it right away. I certainly do see the benefit of it existing. But it seems that it isn't even released yet, so anything I said is moot until it can actually be widely used and feedback comes in. It is cool that you can push to both, but is that the same thing as fully using both in tandum without choosing one or the other as the primary? That sounds like a backup, but not really an ability to actually utilize both simultaneously. I just don't think it's going to catch on broadly for years and don't really see that as a problem with it as a concept. I suspect it will be used by a lot of smaller niche projects early on though. I will certainly be trying it out. But for really big projects? I just wouldn't take their silence as a negative sign necessarily. It can take years for bigger machines to seriously consider a new tech (See Bitcoin and even Nostr in general).