You’re right, it’s a simple raffle no string attached. Most importantly the reward is 100$ by just commenting username on that post. Thanks for sharing!
Not many casinos are doing this kind of promotion, so this is called generosity as the requirement is very simple. And with this kind of promo, it will demonstrate how liquid MetaWin.com is, as they can easily give $100 by simply commenting on their post. Honestly, I haven't seen many promotions like this. Others may have similar promotions, but there is usually a hidden criterion, such as having to play with a rollover requirement that's hard to meet.