RTP is a long-run average; house edge is the casino’s mathematical share: 96%...
https://www.foxtrot-bookmarks.win/rtp-and-house-edge-describe-the-long-run-maths-not-what-you-ll-get-back-in-one
RTP is a long-run average; house edge is the casino’s mathematical share: 96% RTP = 4% house edge. Volatility describes how uneven results can be. In a short session, wins or losses can swing well away from the average—RTP doesn’t predict your outcome.