Maybe they are talking about this kind of attack.
It's an unix vulnerability and there were/are many bots on the web which are scanning the websites for the existence of the bug and try to install nasty things to the webserver.
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But you didn't. The cards don't cost Valve anything to produce. But they do earn Valve money when you trade them through the market.
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Please, and just in case, DO NOT CREATE MORE GIVEAWAYS for Warlock II with Keys obtained from the GamersGate "deal", because they're going to be revoked:
" Official response
Unfortunately, after the forced update of the web-site due to the bot attack that happened all over the web, we had a small glitch regarding the pricing for the game on our co.uk website and this game in particular was wrongly priced for 0.00. We have fixed the bug promptly and had to revoke the keys due to the obvious wrong pricing on it. Unfortunately, this will result in the keys being deactivated. We apologize for the inconvenience this has brought anyone. "
SOURCE: GamersGate Moderator "m661", http://www.gamersgate.com/gametutor?issue=252430
UPDATE: And indeed the game has been revoked on Steam: http://www.imagebam.com/image/291a5b362743432
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