The city of Detroit is about to become the first municipality in the United States to intervene directly in a legal dispute against prediction markets.
The city hall requested judicial permission to present an amicus curiae (friend of the court) document in the case involving the Coinbase brokerage and the state of Michigan, thus signaling a movement towards institutional protection for regulated gaming operators in the region.
How prediction markets threaten regulated sector revenue
Detroit’s entry into the dispute is economically motivated: the city is a central hub for iGaming and is home to three large commercial casinos.
According to the Michigan Gaming Control Board, these operations generated more than $100 million in monthly revenue in the first few months of this year, yielding more than $24 million in taxes for the state.
For the city hall, the expansion of locally unlicensed event contracts represents a direct competitive threat to regulated infrastructure.
As prediction markets increasingly resemble the traditional betting format, municipalities with high economic exposure to the sector have begun to demand an active role in defining how these new verticals will be framed and taxed.
The regulatory clash in Michigan and the chain reaction of municipalities
At the center of the lawsuit is Coinbase, which has partnered with Kalshi and is trying to prevent the government from enforcing state gaming laws against its contracts.
The technology company argues that it operates under federal regulation, but Michigan argues that negotiations linked to sporting events constitute local betting.
Additionally, the Polymarket platform and Robinhood are also fighting simultaneous legal battles against the state.
On the other hand, Detroit’s movement is not an isolated case and points to a new trend in inspection.
Earlier this month, the city of Baltimore sued six major sweepstake operators, alleging that the “dual currency” model violates consumer protection laws.
This scenario confirms that local governments are taking the front line in repressing emerging formats that operate outside traditional taxation structures.
