Underdog, PrizePicks Outpace Monkey Knife Fight

The real moat in player prop fantasy is not inventing the format, it is turning a simple over or under game into a habit and a customer pipeline. Monkey Knife Fight got there first, but Underdog and PrizePicks built stronger repeat use loops through daily pick'em volume, sharper branding, and a cleaner path into bigger gaming products, while Bally's treated MKF more like an acquired database than a product to keep compounding.

• Monkey Knife Fight was large enough for Bally's to buy it in March 2021 as the third biggest DFS operator, with about 200,000 registered users, 90,000 depositors, and coverage across 37 states plus D.C. and Canada. That shows it helped prove demand for simplified player stat contests before newer brands scaled the format harder.
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• What won next was execution, not format novelty. In pick'em, the core game across Underdog, PrizePicks, Betr, FanDuel, and DraftKings is broadly similar, which makes product features easy to copy. That shifts competition toward brand, creator distribution, social product loops, and staying top of mind on a fan's phone.
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• Underdog and PrizePicks also fit a bigger strategic arc. Pick'em drives frequent transactions and can feed users into sportsbooks through a shared account and wallet. Underdog explicitly linked fantasy credentials and balances into its North Carolina sportsbook, while Bally's shut MKF down by early 2023 instead of making it a long term feeder product.
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The category is heading toward a few scaled consumer brands that use fantasy as the low friction front door for sports betting and other higher value gaming. That favors operators that keep shipping product, own the customer relationship inside one app, and make pick'em feel like part of a larger entertainment stack rather than a standalone contest lobby.