Key TakeawaysFanDuel parent Flutter Entertainment warned that its U.S. results will be lower than anticipated because too many NFL favorites won this season, giving customers better payouts.The online gambling company said the "customer friendly" wagering resulted in lowering full-year U.S. revenue by $370 million.Flutter also cut its forecast for U.S. adjusted EBITDA. Not enough upsets in the National Football League (NFL) season will hurt results for FanDuel parent Flutter Entertainment (FLUT). The online ...