system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the influence of certain sports spread across the world while others online exist in one country

For example gridiron/NFL is only in America, it isn't even in any of the two bordering nations. While on the other hand football/soccer is known all around the world. Then there are some in between such as cricket or rugby where it is only in a few countries.
gpt
Football/soccer is a sport that has very simple rules and minimal equipment to play. All you really need to play at a recreational level is a ball and something to mark off the goal area (some cones or sticks).  This makes it popular with children because if its accessibility, and allows it to spread worldwide.