Huh... funny, this story sounds sort of familiar... ah yes - that would be because it's echoing what I always say about piracy. Namely, don't pirate things, but don't pointlessly spend time and effort trying to stop it either - you can't, so you might as well take whatever word of mouth exposure you can get, regardless of how that word of mouth is generated.
There's a reason a lot of musicians come out in favor of file-sharing - they'd much rather have a million people downloading their material without paying than be stuck with just one hundred legitimate customers, because now a million people know who they are; presumably some of those people will tell other people about them, and maybe those people will actually buy stuff from them, or the freeloaders may go on to attend concerts or pick up band merchandise, etc.
With video games the software is largely the entirety of the service though, so encouraging people to spread it about without paying is somewhat counterproductive, as the word of mouth exposure you'd gain would be significantly offset by the bit where that game is how you're making any money (not just a part of it) - you're better off just ignoring piracy and focusing on quality assurance testing and marketing really - but piracy is still a form of advertising and, as we see from this example, it can indirectly benefit developers.