RTP is a long-run return; the house edge is the casino’s statistical share: 96%...

https://www.tool-bookmarks.win/rtp-is-a-long-run-average-not-a-promise-for-tonight-96-rtp-means-a-4-house

RTP is a long-run return; the house edge is the casino’s statistical share: 96% RTP = 4% house edge. Volatility affects how wins and losses arrive. In a short session, results can be far from the average—RTP doesn’t guarantee a payout.