RTP is a game’s theoretical return over a very large number of plays, not a...
https://echo-wiki.win/index.php/Is_a_4%25_House_Edge_%E2%80%9CSmall,%E2%80%9D_or_Does_It_Add_Up_Fast%3F
RTP is a game’s theoretical return over a very large number of plays, not a promise for one session: 96% RTP means a 4% house edge on average