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Aren't you leaving out all the networking by the games by doing that? My college was famous for blocking multiplayer starcraft games a new way every week and us students finding a way around it every week. Kind of sad Blizzard eventually sued the B.NET replacement that was needed due to crappy filtering like that.

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In most cases, this shouldn't pose any issues (though some games doing crazy things with networking could be affected).

These rules restrict the ports listening directly on the internet. The average gaming PC is behind a home router, has no ports reachable from the internet, and network games still work fine.

If your college was like mine, what they did was filtering outbound connections, which is different. Outbound traffic is unfiltered by default on EC2, and it's fine to leave it that way.

It's probably not a good idea to play any competitive multi-player games on this service anyways, considering the additional latency and higher possibility of interruptions.

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