RTP is a long-run average; the house edge is the casino’s share: 96% RTP = 4%...
https://charlie-wiki.win/index.php/If_I_Want_to_Play_Longer,_Should_I_Lower_My_Bet_Size_or_Pick_Lower_Volatility%3F
RTP is a long-run average; the house edge is the casino’s share: 96% RTP = 4% house edge. Volatility affects how wins and losses arrive. In a short session, results can swing widely—the average is no promise of what you’ll get.