Most coverage of sports betting and prediction markets’ growth focuses on the bettors and the risks they take on, the money they can lose, the addiction concerns regulators are increasingly worried about.
There’s a second population absorbing real, sometimes serious consequences from this same boom, and it gets far less attention. The people whose real-world actions or reporting actually determine whether a bet pays out.
A recent survey of 100 Major League Baseball players across 23 teams, conducted by The Athletic, found that 81 had been personally confronted or contacted by an angry bettor over the outcome of a game.
This is a number so high that one player surveyed suggested there was little point even asking the question anymore. It’s not an isolated athlete experience, it’s close to the norm.
This isn’t specific to baseball, either. A separate analysis commissioned by the NCAA, using social media threat-monitoring firm Signify Group to review the accounts of more than 3,000 college athletes during major 2024 tournaments, found that angry bettors were responsible for as much as 45% of all abuse directed at players during some of those events.
Tennis has its own well-documented version of the same problem. The WTA now employs a director of safeguarding and dedicated threat-assessment technology, after tracking thousands of abusive messages sent to players.
American player Jessica Pegula has publicly shared examples of what she’s received after losses, and French player Caroline Garcia has described messages following a US Open loss that included encouragement to harm herself and threats against her family.
The harassment described by surveyed players ranges from mocking comments to direct financial demands to genuine threats. These include, according to multiple athletes, threats extended to their families.
This isn’t hypothetical escalation. A sports bettor known online as “Parlay Patz” was federally charged in connection with sending threatening messages to multiple professional athletes across baseball, football, and basketball after losing wagers on their performances. He is facing up to five years in prison under charges of transmitting threats across state lines.
That case predates the current prediction-market boom, but it establishes that this pattern can and does cross into actual federal criminal conduct, not just uncomfortable social media exchanges.
The most serious documented example of this pattern doesn’t involve an athlete or a game outcome. It involves a journalist reporting on an active war.
In March 2026, Times of Israel military correspondent Emanuel Fabian reported that an Iranian missile had struck open ground near Beit Shemesh.
A Polymarket contract on whether Iran would strike Israel that day resolved based on exactly that kind of detail. Bettors who’d wagered against a strike pressured Fabian, including with direct threats against him and his family, to change his account. [See our full coverage of this story]
This is part of a broader pattern of alleged insider trading on prediction markets tied to real-world events, not an isolated incident
Documented cases include suspicious trading around Nicolás Maduro’s capture where a $32,000 bet turned into $400,000 profit hours before a US operation was publicly announced.
In another case, Israeli authorities charged an IDF reservist and a civilian with using classified military intelligence to place winning bets on the timing of strikes on Iran.
This has already produced real legislative response
The DEATH BETS Act (Rep. Mike Levin, Sen. Adam Schiff) would bar CFTC-registered platforms from listing contracts tied to terrorism, assassination, war, or an individual’s death.
A second bill, the BETS OFF Act (Sen. Chris Murphy, Rep. Greg Casar), specifically targets prediction markets allowing bets on government operations where the outcome may already be known to some participants, aimed directly at the kind of insider trading seen in the Maduro and IDF cases.
This data is emerging at the exact moment prediction markets are expanding their presence in professional sports, not retreating from it. Polymarket has an active partnership with Major League Baseball, and Kalshi has been striking agreements with a growing number of teams.
That’s happening in parallel with the legal battles covered elsewhere on this site, where multiple states are actively suing Kalshi over whether its products constitute gambling at all.
Whatever the outcome of those legal fights, the athletes whose performance these contracts and bets are settled against are already absorbing a real, documented cost from the industry’s growth.
None of this is an argument against sports betting or prediction markets existing. That’s a broader legal and policy question covered in depth elsewhere on this site. It’s a narrower, more specific point.
As these products expand into direct partnerships with leagues and teams, and into contracts tied to live geopolitical events, the people whose real-world actions or reporting determine the outcome are a real, largely unaddressed stakeholder in that growth.
That ranges from an MLB pitcher managing DMs after a bad outing to a war correspondent facing death threats over how he described a missile strike. Leagues and platforms have begun building institutional responses.
The WTA’s safeguarding infrastructure and Polymarket’s account bans are both examples, but per the available reporting, most individuals caught in this position are still left managing it largely on their own.
The post The Real Cost of Prediction Markets and Sports Betting: Threats Against the People Whose Actions Decide the Outcome appeared first on BitcoinChaser.
