RTP estimates returns over time: 96% RTP means a 4% house edge. Volatility...

https://sofiascoolcolumn.rivetgarden.com/posts/what-does-risk-adjusted-return-even-mean-for-gambling

RTP estimates returns over time: 96% RTP means a 4% house edge. Volatility affects how sharply results swing. In a short session, you can win or lose much more than the average suggests; past results don’t predict what comes next.