Bettors staked more than $2.4 billion, while a lower sportsbook hold cut operator revenue and sharpened debate over prediction markets.
September receipts slipped slightly from August, while iGaming tax collections again exceeded $60 million.
The sportsbook declined to provide Congress with some customer-level records, citing privacy and financial-information obligations.
Lawmakers want betting, account-restriction and problem-gambling screening data for every recipient before an Oct. 20 deadline.
Michael Rubin said heavier marketing is intended to narrow the sportsbook gap with DraftKings and FanDuel as prediction markets reshape competition.
The shared Michigan, New Jersey and Pennsylvania poker pool outpaced a US market that declined slightly year on year.
Handle rose from July and from a year earlier, while monthly revenue fell to a two-year low and the sportsbook hold declined.
Online casino adjusted revenue rose from a year earlier, while sportsbook receipts fell 29.3% and total online gross receipts declined from July.
A 13% rise in wagers delivered only about $17 million in revenue as opening Sunday results favoured bettors.
Florida attorney Jennifer Hoekstra says notifications, bonuses and VIP programmes are designed to keep vulnerable bettors wagering.
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