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

https://www.random-bookmarks.win/rtp-is-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 affects how wins and losses arrive; higher volatility can bring longer dry spells