>>315502213
Just thinking out loud:
For worlds users already know, if they have the choice, they would probably go directly to it, without going through an "exterior". Like I'm not searching for 4chan in google every time I want go there, I have it in favorites or my browser kindly remembers it when I type "4" in my address bar.
If we continue the internet comparison, I discover new websites either because they're linked on another website, or because I'm looking for something and google it. VR rooms to VR rooms links are super easy technically, the only questions are UI. I have no idea how Google-like searches for VR rooms could work.