[sowbug]

Putting on my Pollyanna hat...

Or it could make it a lot cheaper, if the server were developed entirely on open-source infrastructure from the start. Hopefully the actual game logic would be developed entirely in-house, making it easier to audit before releasing.

[jurgenburgen]

Most likely the engine providers would spin off their server components as OSS for this express purpose so their customers can easily comply. This regulation could be a huge win for making the game industry adopt more OSS.