I was into Google Wave robots development at that time and I had trouble seeing how this could scale. There was a ton of data sent to developer's App Engine ins

I was into Google Wave robots development at that time and I had trouble seeing how this could scale. There was a ton of data sent to developer's App Engine instance for every edit in a conversation. It also was a privacy nightmare. IMO it was just a test from Google to see how reliably this would work, I doubt they had the intention to let it run as a product. But I really loved it.