RTP estimates returns over many plays: 96% RTP = 4% house edge, not a promise...

https://www.sierrabookmarking.win/rtp-is-a-long-run-average-not-a-session-promise-96-rtp-means-a-4-house

RTP estimates returns over many plays: 96% RTP = 4% house edge, not a promise for one session. Volatility shapes how wins and losses arrive—steadily or in larger swings. Short runs can differ sharply from the average, and you can lose your stake.