South Korea police send Polymarket users notices to appear over suspected illegal gambling

South Korean police have sent notices to appear to all Polymarket users as part of an investigation into suspected illegal gambling. For PSPs, acquirers, and banks that touch prediction markets, the signal is straightforward: if local authorities treat a platform’s activity as gambling, the payment flows can become the first thing under pressure.

1. According to the report, the notices were sent to all Polymarket users, not just to the platform itself or to a small subset of accounts. That broad scope matters because it suggests the investigation is not being framed as an isolated compliance issue.
2. The suspected offense is illegal gambling. In high-risk payments, that label is the one that tends to change underwriting, settlement, and account review behavior quickly, because it can move a merchant from “watch list” to “stop list” in short order.
3. The case is in South Korea. For payment providers, the jurisdiction matters as much as the merchant category: local enforcement posture is what determines whether exposure stays theoretical or turns into a concrete onboarding and processing problem.