We tested the NFL's $1.8 billion prediction market claim. Is it true?

发生了什么
An NFL Supreme Court brief cited $1.8 billion in related opening-Sunday trading. USA TODAY checked the claim against Kalshi and Polymarket US data.
摘要按规则整理自下方来源原文

An NFL Supreme Court brief cited $1.8 billion in related opening-Sunday trading. USA TODAY checked the claim against Kalshi and Polymarket US data.
摘要按规则整理自下方来源原文