If you check the rules for the Goguryeo formable specifically, there is an addition that states that China must be an AI if you're in a public server.
they are added (technically tem, indyhound, and altaria also could have added them)
as for Goguryeo, the rules are the same as any other formable. you can either take china, get manchuria to separate, or try to annex manchuria while it's still a part of china.
The Chapters are individual parts of the game, so it only makes sense that they are added as a part of the Individual Levels leaderboard. This would make it easy to set up multiplayer categories since you could have each chapter on its own with a category for each player count. This would also make it easy to have an "All Chapters" full-game category when the game is either finished or cancelled.
Personally, I feel like the "2 Chapters" category should be removed because at the time of the leaderboard being set up there are already three chapters released. It doesn't make sense to have a category of only 2/3 of the game.
Also the "Jumpscare" category should be removed since it's just Death% with a fancy name but supercrazestar likes bad categories so I doubt that will happen
i... don't see how that's relevant?
isn't any% completely pointless since it's just the fastest IL
there is no reason for a separation to be made, it's just playing the game slower
i think the chapters should be moved to an IL board because it doesn't really make sense having each chapter individually right next to all of them put together
plus that's exactly what the IL feature is for