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

https://www.bookmark-ignite.win/rtp-shows-the-share-of-stakes-a-game-is-designed-to-return-over-a-very-large

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.