So right now we are using a MongoDB replicaset which can be scaled. We are going to move to AWS soon instead of a single node for the web server. I think the most difficult thing to scale might be the actual chat server, but we've done some load tests and it can manage at least 500 concurrent users right now. Scaling the chat server will be the first thing I work on after finishing the last remaining basic features.
Yes! That's the direction we are going but we have some ideas to take chatrooms to the "next level" so to speak. Right now we just want to be another option that's easier to keep up with : ). I assure you that I am not a graphic designer so I appreciate the comments on my attempt to make it look nice xD. We may do a small color palette change and/or some design changes when the core functionality and scaling gets taken care of or at least address and pre-planned.
Please feel free to send me any suggestions and or feedback via support@toka.io. We have a long list, but I definitely want to do what it takes to make it a lot more accessible/useful than irc and/or any other chatroom platform.