A King County Superior Court judge ordered Kalshi, the prediction-market platform now valued at roughly $22 billion, to stop offering most of its wagers to Washington residents by September 2.
The AG's office described it as banning "a substantial part" of the company's business, not all of it.
Senators who took up the issue wrote that the platforms pose "an existential threat to tribal sovereignty by undermining the revenue that tribes rely on for government services," according to Route Fifty's coverage of the growing tribal pushback nationally.
States only gained the authority to write their own sports betting rules at all because of a 2018 U.S.
The CFTC has already intervened to block state-level restrictions on Kalshi in both Michigan and Minnesota, arguing federal law preempts those states' gambling rules — the opposite outcome from what just happened in King County.
A King County Superior Court judge ordered the $22 billion prediction-market platform Kalshi to stop taking sports, election and entertainment wagers from Washington residents by September 2, siding with the state attorney general and tribal gaming groups over Kalshi's federal-jurisdiction defense.