

It is explained in the readme linked in the OP.
tl;dr: they were using it before, but the codebase is old and hard to maintain and also doesn’t scale well in an online cloud office context.
Personally I have been using both (ONLYOFFICE and Collabora Office), and I can see why people prefer the former, even though for small personal use the latter is also ok.














Cockpit is nice for that. The Podman integration of it is also useful.