Definition 4. , it's a sport
This is what the dictionary says;
noun 1. an athletic activity requiring skill or physical prowess and often of a competitive nature, as racing, baseball, tennis, golf, bowling, wrestling, boxing, hunting, fishing, etc.
2. a particular form of this, especially in the out of doors.
3. sports, (used with a singular verb) such athletic activities collectively: Sports is important in my life.
4. diversion; recreation; pleasant pastime.
It is a sport by definition, the sad part is we call ourselves a free nation but can't play cards online for money... silly in my view.
