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

https://emmasnewnews.opalvector.com/posts/what-does-theoretical-return-mean-on-a-slot-info-page

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility describes how bumpy results can be. In a short session, you may win or lose far more than the average suggests, so set a limit you can afford.