Earlier quoted context omitted.
Sylvain from Pusher here. I just up the app quota for the time being since it currently using our free plan. The app should work fine now.
Good PR. Didn't knew Pusher yet. Am i the only one?
Pusher's been around for some years. In fact they were one of the pioneers of "realtime-push-as-a-service".
That said, the space is still relatively new (yes, there is a whole space! http://leanstack.io/realtime-backend-api ). Most developers of realtime apps use their own hosting but are gradually warming up to the cloud.