It's available from every users dashboard (it's a ~2 MB compressed GeoJSON file). It includes both libraries orignally imported from OSM and additional libraries added by users.
While I still think the whole OSM process to submit back is a bit too much for the time I have available (but I still understand and respect), at least I want to give users an additional option to retrieve the data (in addition to the public API).
If you have any other advices, I will be glad to hear them and, compatibly with my spare time, I will try to implement them (if they make sense and are useful for users) :)
Thanks