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

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: at 96% RTP, the house edge is 4%. Volatility describes how uneven results can be. Short sessions can swing sharply, and past outcomes don’t predict the next spin.