Interesting:
Docs is the result of a joint effort lead by the French 🇫🇷🥖(DINUM) and German 🇩🇪🥨 governments (ZenDiS). We are always looking for new public partners (we are currently onboarding the Netherlands 🇳🇱🧀). Feel free to reach out if you are interested in using or contributing to docs...
Pretty sure Libre only does local document collaboration, having it online is helpful for teams far from each other or who simply don't have the infrastructure for their own central server of this kind.
Well this has been running in our Nextcloud and works pretty well collaboratively :)
https://github.com/CollaboraOnline/online
not sure how it scales, but definitely an alternative that can be built on