It allows you to request a bot to join a Minecraft server so that they can track it, and analyze it on a weekly basis. Such as generating a [url=https://mcl.ist/render/map/09822a13b9c71fbbdc8d49f6bb3e7e928d24fb20eb596a2dd12105cf4e7eb346]compressed world preview[/url] of its spawn. They are "tracking 311808 servers, with 16267499 total pings." It's a cool way to check or make a record of a server if it isn't in the database.