So GOG.com has a game called GWENT on PC and mobile devices. They really want it to compete with Hearthstone, MTG Online, and other digital deck-based games, and they want to be able to hype you about it through their email newsletter.
If you sign up, you’ll get a completely free copy of The Witcher: Enhanced Edition and a free GWENT Card Keg. If that’s worth sharing your email (it was to me) you’ve got some freebies coming.