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

https://post-wiki.win/index.php/Is_Casino_Gambling_Ever_a_Good_Investment_Idea%3F

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility describes how uneven results can be. In a short session, outcomes may differ sharply from the average, so set limits and expect uncertainty.