I think that there should be a landing page for chat room URLs for people who are not signed up to the forum. The reason is simple: if you can get people into your chat room, they might use your forum.
It’s really easy to get a hundred people into a Telegram or a Discord or even an Element server. It’s really hard to get people to use a forum. But if the forum is always right there (a page away), then people in the chat might use it, which will drastically boost engagement on the site and make it stickier / more attractive for other users.
Currently, when you link a chat room, it just takes you to the front page of the forum.