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

https://riversexpertop-ed.iamarrows.com/is-there-a-rational-way-to-gamble-without-lying-to-myself

RTP is a long-run average; the house edge is the casino’s expected share: 96% RTP = 4% house edge. Volatility describes how uneven wins can be. In a short session, results may differ sharply from the average, including losing streaks.