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

https://wool-wiki.win/index.php/What%E2%80%99s_the_Simplest_Way_to_Explain_House_Edge_to_a_Friend%3F

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—steadily or in bigger swings. In a short session, results can vary sharply either way.