DraftKings spends $1B+ a year on sales & marketing, including customer bet deposit promos. In 2023, data science team built ML model to find gamblers likely to lose money. It also created a “risk score” to flag gamblers “headed for trouble” (but DraftKings “sidelined” the tool): “The documents show how the model Mr. Butts worked on analyzed dozens of data points for each gambler, including how frequently they played, their daily account balances and how much they typically lost compared with…