Concerning #Fedilab, with close to 8 million messages indexed, I think #HolosDiscover now has enough content to be worth integrating.
Full API support would allow pinning tailored timelines and interacting with new content. This would be particularly useful for small instances.
More about HolosDiscover: https://discover.holos.social/how-it-works
If you're a dev: https://discover.holos.social/api-docs