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

https://cesarsnicenews.capitaljays.com/posts/why-does-my-friend-think-a-progressive-system-will-force-a-win

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility shapes how wins and losses arrive. In a short session, results can differ sharply from the average; past outcomes don’t predict the next one.