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

https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/

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.