This is not for live chat this option is available for only live support if you want to use live chat then check to right last one option is for live chat but you must wager 100$ for this because if someone is less then 100$ wagering then he cannot use this live chat option on stake.com its good for many as most of members use this for begging and abuse.
It is live chat for support your imagination is right. But if the person means to chat with other person then that is another point. In this case the person should reach specific wagered to get be enable for the live chat option with other player.