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

https://www.bookmarkmaster.win/rtp-estimates-a-game-s-long-run-return-96-rtp-means-a-4-house-edge

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. In a short session, luck can swamp the maths—you may lose or win more than the average suggests.