France has moved from warning Polymarket to blocking it, and the weather-bet scandal at Charles de Gaulle shows why regulators are no longer treating prediction markets as harmless speculation.
France's National Gambling Authority, the ANJ, ordered French internet service providers to block access to Polymarket on July 16, calling the site an illegal, unlicensed gambling and betting operation. Reuters reported the order on July 17, and the regulator said the block would stay in place as long as Polymarket remained outside French gambling rules. That is a hard move. It also isn't surprising.
You can see why France acted now. Polymarket has been taking wagers on everything from football to elections - and, lately, on weather readings too - and the weather markets gave regulators an unusually clean example of the risk. A single sensor at Paris Charles de Gaulle Airport became the settlement point for daily temperature bets. When that sensor produced strange readings in April, traders got paid.
The World Cup timing only sharpened the issue. France and England were scheduled to play the tournament's third-place match at Hard Rock Stadium in Miami on Saturday, July 18, according to FIFA, and those kinds of fixtures draw attention from ordinary bettors as well as crypto traders. If you're a regulator, you don't wait for the next obvious betting surge before testing whether an unlicensed platform will respect your market.
The Weather Bet Was The Weak Spot
The April case is still under investigation, so don't call it proven fraud. Call it what it is: a suspected manipulation that exposed a bad design choice. Bloomberg reported that automated readings at the Meteo-France station at Charles de Gaulle spiked by 4 degrees Celsius on April 6 and 5 degrees on April 15, both in the evening, and both spikes became the highest readings for the day. CNN reported that one Polymarket user won $14,000 on the April 6 market after the sensor hit 22 degrees Celsius, and another won $20,000 on April 15 after a similar reading.
That is not abstract platform risk. It is a thermometer near an airport, a contract tied to one data source, and real money moving when that data source behaves strangely. Meteo-France filed a complaint. It alleges tampering with an automated data processing system, and Paris airport police took the case. Online speculation about a lighter or battery-powered hairdryer remains just that, speculation. But the basic problem doesn't need the prop to be real.
Polymarket later shifted its Paris temperature source from Charles de Gaulle to Le Bourget Airport, according to several reports on the April incident. Fine. But the point remains. If a prediction market pays out on one vulnerable input, then the market doesn't only predict the world. It gives someone a reason to interfere with it.
America Is Fighting State By State
France's approach is blunt: one regulator, one order, national access blocked. The United States looks messier. Nevada has challenged Polymarket over state gaming rules, and Massachusetts has fought over whether sports event contracts amount to illegal betting. Wisconsin went further still, suing Kalshi, Polymarket, Crypto.com, Robinhood and Coinbase. The CFTC responded on April 28 by suing Wisconsin, saying federal law gives the agency exclusive authority over regulated event contracts.
Minnesota has pushed the same fight toward a deadline. The state attorney general said in June that Kalshi, Polymarket and the CFTC were seeking to stop Minnesota's prediction-market statute from taking effect on August 1. That's the split you need to watch. States see gambling. The CFTC sees federally regulated derivatives - and platforms just see a market they can scale before the rules settle.
France doesn't seem interested in waiting for that kind of legal sorting. The ANJ had already moved against Polymarket in November 2024 after a French trader placed large bets on the U.S. presidential election, and Reuters reported that French visits kept rising, reaching 578,751 in June. A transaction ban didn't stop demand. So the regulator escalated to an ISP block.
Polymarket should have seen this coming. The platform has grown by making almost anything tradable, but the broader the menu gets, the more often it crosses into regulated territory. Spain temporarily banned Polymarket and Kalshi in May. Singapore, Brazil, Indonesia and other governments have also restricted or blocked prediction-market activity this year, according to reports tracking the sector. You don't need every country to agree on the legal theory for the pressure to become real.
There is a useful lesson here for anyone building in crypto. Regulators will tolerate novelty longer when the harm is theoretical. They move faster when they can point to a hacked-looking weather sensor at a major airport and a trader walking away with tens of thousands of dollars. Polymarket hasn't said whether it will seek a French license or fight the block. For now, French users trying to reach the site will hit the regulator's answer first.
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