Consider any popular slot game the games are not always rigged but the math is against us. Because most gamblers dont understand the math behind tbe games, the result is that they blame the machines to be rigged rather than their own greed and bad luck that is leading to ruin.
The small wins are just incentives to make you play more giving a false sense of confident that you can still win. So be careful when you start freshly grinding after a small win.