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

https://paxtonsexpertop-ed.zenbloomer.com/posts/variance-vs-volatility-in-slots-are-they-the-same-thing

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility shapes how wins arrive—often or less often, and in larger or smaller amounts