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The Trouble with Forking Mastodon
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
It actually does have that nowadays, it's just that the feature requires Elasticsearch to work, which is one extra piece of infra for admins to worry about.
It is about as common as using a database server for content though to use something like ES, Solr or similar software for search.
It absolutely is. Yet, as Sean said, it's also yet another bit of software to run and maintain, and ES is known to be a bit of an effort to keep going well.
Admins having only finite amounts of time and/or resources, might make the very understandable decision to leave it out.