https://www.reuters.com/legal/us-federal-court-upholds-rulin...
https://www.reuters.com/legal/us-federal-court-upholds-rulin...
> Polymarket has blocked access to Americans since 2022, following a settlement with the Commodity Futures Trading Commission, which accused the company of running an unregistered derivatives-trading platform. Traders say the ban on U.S. users can be circumvented using virtual private networks.
>Election betting was legalized in the U.S. under a recent federal court ruling, but only for CFTC-regulated markets, so Polymarket has remained off-limits to Americans.
https://www.wsj.com/us-news/law/fbi-polymarket-ceo-investiga...
Polymarket has avoided coming under regulation by the CFTC by avoiding US users. For their markets to be legal under current regulations they'd have to have all their markets approved by CFTC.
It should be obvious what happened here: Polymarket has been offering grey or black markets to users, using only IP address as the discriminator, which is very easy to work around. They've operated under the Feds' radar for quite some time, and the Feds noticed them after they started getting significant press regarding the election.
The election is the reason they got noticed, but the likely crime itself is sports, not elections.