@raphael I didn't know the instances would copy the messages. Interesting! I think search engines need to be redesigned to respect robots of the origin instance then. If they are not designed for this, it surely looks local. That's kind of a mess then, from search engine perspective.
Strange enough, if I search with my search engine based on SearXNG the terms "final fantasy site:kbin.social", then it finds a few links. They are only based on tags or person, not the actual content. So maybe use tags, if you want to get indexed anyway.