There’s a common marketing slogan in sports betting: “Sweat the game, not the payout.” In other words, when dealing with legitimate sportsbooks and not some shady neighborhood bookie, gamblers shouldn’t have to worry about getting stiffed. Yet bettors say gaming operators aren’t always living up to that promise, and some industry officials agree. Bookmakers sometimes use a clause in their fine print as an “insurance plan,” as one top regulator put it, to get out of paying big winners — and multiple industry observers say the practice is increasing.
Source: wiktionary