The Weekly Leagues are a recurring weekly competition that pits an Artist against a group of four other Artists to see who gets the most amount of Trophies during that week. See also: Help Article: "How can I earn League Trophies?".
At the end of each week, the Artist with the most Trophies wins Bonus Love relative to 10% of all the in-show Love earned by all Artists in that specific group (minimum of Bonus Love equal to 5 $USD). The Bonus Love will only be awarded to the Leagues that earned some amount of Trophies, so groups made completely of inactive Sessions Artists will not benefit from this system.
The Bonus Love will be added to your account within 48 hours of the League ending. See also: Help Article: "When will I receive my Bonus Love from winning a Weekly League?".