75% of small communities, if not higher, don't use lemmy-federate to expand the visibility of their community. The user makes the community, broadcasts a few posts locally and then gets sad that no-one replies (because it can only be seen locally). Nor do they make use of !newcommunities@lemmy.world or !communitypromo@lemmy.ca to advertise.
I use lemmy-federate a lot to help this, but it's sometimes too late after they set the comm up.