When creating a custom server for a minigame there can be a option to make it public to get more players
Lets say you have no friends but want to make a custom sky wars minigame to show then there can be a new option to make it public then when some one wants to join they can click a new avatar in the hub that shows how’s custom server you can join
This is a duplicate suggestion I think is what they meant, use the before posting next time and use keywords that relate to your idea to make sure you have an original idea and don’t make a duplicate suggestion