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

https://ellassmartperspectives.urbanvellum.com/posts/why-do-i-lose-fast-on-a-high-rtp-slot

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility shapes how wins and losses arrive—steadily or in bigger swings. In a short session, results can vary sharply either way.