Prediction markets have exploded in popularity in recent years, and with the boom has come increased scrutiny on what people are betting on—and when they’re betting.

The drama kicked off with a well-timed bet on the US military’s arrest of Venezuelan President Nicholas Maduro in January. The Iran War this month has also produced a flood of available wagers on the conflict, leading to worries that insiders in government could be profiting from information before it goes public.

The Center for American Progress, a nonpartisan think tank, said in an analysis published on Wednesday that the use of crypto is weighing on public trust in prediction markets.

“According to blockchain analytics platform Bubblemaps,…