On mobile you can share links to people to make it easier for them to join you. This makes sense on the "here" tab.

But the same button appears when you are looking at other worlds as well. As in my example it shows up on one of my uploaded worlds. Here it would seem like I can send a link to that world, but it still sends a link to your current instance.

I think this button should be removed when you look at other worlds if they only lead to the one you are in anyway.