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

https://www.bookmarkidea.win/rtp-and-house-edge-describe-the-long-run-maths-not-what-you-ll-get-back-in-one-1

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.