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

https://abigailsimpressivechat.yousher.com/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 and losses arrive. In a short session, results can differ sharply from the average; past outcomes don’t predict the next one.