Not very sure if this is by design/expected, but capturing packets from a freshly booted iPad seems to indicate that the browser leaks DNS queries and HTTP GET requests when visiting YouTube through this browser. I am transmitting outside the tunnel
1) DNS query to YouTube cache server
2) GET request to Google's servers for /videoplayback
This seems isolated to the QuickTime player only. No other DNS queries or traffic appears to be visible. I suggest you warn users that video playback does not go through the tunnel.
It would be nice to choose the level of security you think you can afford on the security-inconvenience tradeoff curve. Especially since it is likely to increase the takeup rate.
I don't think that the author has concluded that experimental games are less likely; rather, games without a multiplayer component, such as those pushed by Tim Schafer, will not be picked up due to the churn.