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Santos’ case represents the most severe among four disciplinary settlements announced by Kalshi, which has faced increasing scrutiny concerning insider knowledge risks and event outcome influence by market participants.
Santos is not the only individual disciplined for trying to game the prediction market system. Ben Midgley, a Republican candidate for the governorship of Maine, admitted purchasing under $1,000 worth of contracts related to his campaign. He accepted a $5,434.30 fine and a three-year suspension.
Meanwhile, Laurie Buckhout, a candidate for a North Carolina congressional seat, was fined $2,589.96 and suspended for three years after buying under $1,000 of contracts linked to her race.
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At the same time, prediction market operators are facing regulatory tussles in the US. State regulators are moving to shut down the firms under gambling laws. The companies say their contracts should be regulated at the federal level as derivatives.
However, the sector has grown substantially despite such disputes. Bernstein predicted in April that annual prediction market volume could reach $1 trillion by 2030. The research estimated volume was around $51 billion in 2025 and could grow to around $240 billion in 2026.
The partnership with Yahoo Finance wraps up as prediction markets push for broader distribution across financial media, sports, and entertainment platforms. For Polymarket, the loss of the Yahoo Finance hub is one distribution channel, but other partnerships remain intact.
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Operators and companies linked to them are also prohibited from acquiring, licensing, or exploiting rights to sporting events held in the country. In the area of administrative penalties, the rapporteur’s text incorporates the new infractions into the existing sanctions system in Law 14.790 of 2023, which provides for fines of up to BRL2 billion ($392.8 million).
One of the main changes made by Vieira is the creation of the crime of promoting unauthorised betting operators. The penalty is one to five years imprisonment. This may be increased by one-sixth to two-thirds when the promotion is done by a digital influencer, athlete, or well-known person, due to their greater ability to reach the public.
The rapporteur also added a rule designed to prevent the immediate movement of professionals between companies in the sector and bodies responsible for authorising, classifying, regulating and overseeing betting. Anyone who has maintained a significant link with an operator or representative entity of the market will be barred, for 24 months, from assuming certain regulatory functions. A quarantine period of the same duration will also apply in the reverse movement, for the transition from the regulatory body to the private sector.