I don't know what sites offer that since I always turn off the chat box while playing since it's a big disturbance for me to see the nonsense chats there, but what I can recommend you since you want free is to go to games and rounds where many sites post their promotion,giveaways and raffles to the lucky users here so it's a good option for you to go since the earnings is quite good for start if you know on what you are doing and also can able to follow the needed requirements ask by the promoters.