I've seen a few questionable ads on IGN from time to time. I think they just don't bother filtering, and as many have said, if you have cookies from games in your history, or if you have cookies from that ad provider that have tracked you searching for any game, you could get served ads for selling currency or other items for that game.
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Olorinus the Ludicrous wrote:
The idea of old school is way more interesting than the reality