Kagi’s “quick answer” gives me a better result:

Quick Answer

The countries in Africa that start with the letter K are: Kenya Kazakhstan [1]

[1] List of countries in Africa in alphabetical order

Though I don’t know if that’s because Kagi has fixed it in the last half hour, or some other factor. Still not a great answer. At least Kagi doesn’t show it by default, at least with my settings.

Expecting communities related to a certain topic to coalesce on a single server doesn’t seem like a good idea to me, but having some kind of community metadata would definitely be nice. As you said it’d be useful as a way to filtering out certain topics, and it might also be handy for community discovery.