Chats in gambling is a good idea and a way to build relationships with fellow players.
As long as there are no signs of cheating say on a poker site, then I think this is a advantage to the players.
Sometimes I felt that chats are so annoying when the people chat like nonsense that is why I don't like to chat while gambling but normally I would like to chat more and more while getting opportunities with new people.
At times, some evil minded people use chat for their own benefit. As they know the people who are at gambling site and chat are the ones who have bitcoins and money for investment, they advertise in the chat of some investment opportunity and try to convince the gamblers to join it. Those investment opportunity can be a scam too.
