RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge...

https://fast-wiki.win/index.php/How_Do_I_Avoid_Getting_Tilted_After_a_Long_Losing_Streak%3F

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility shapes how uneven results can be. Short-run swings can be large, so you may win or lose far more than the average suggests.