It scrapes /r/worldnews with the below parameters (which I may adjust)

• subreddit: worldnews postFilter: postLimit: 75 # Limits the number of posts to retrieve from the subreddit. minUpvotes: 500 # Sets the minimum number of upvotes a post must have to be included. maxDownvotes: 300 # Sets the maximum number of downvotes a post can have to be included. minUpvoteRatio: 0.75 # Defines the minimum ratio of upvotes to total votes a post must have to be included. maxTimeHours: 20 # Specifies the maximum age (in hours) of a post to be included. excludedUrlPatterns: # User defined regular expresions to exclude urls. - .redd.it$ - reddit.com - i.redd.it/\w+ - v.redd.it/\w+ community: worldnews@fledd.it

Looks like the people of reddit select it by upvoting it and then the bot harvests their choices.