Very sorry for the confusion, you are right. I thought .ml disappearing in other instances was due to some restriction they had, but is actually how the fediverse works according to how open certain instances are to others. I experience this on Mastodon plenty and I didn't notice is the same here. Is .world which is putting a restriction which only allows us to see only .world users and comments, while .ml is ways more open. I attributed this to .ml experiencing problems lately but I was mistaken.