Known rules, unknown outcomes on each spin
Deciding to spin Peking Luck means accepting that how often the bonus round comes is not known in advance. Free Spins start on three or more SCATTER symbols anywhere on screen. The result of one session is random at any RTP, so a session can end with a loss even when it runs long.
Before you wager any money, open the game rules in the lobby and check which RTP version is running. Peking Luck is listed here with one RTP version only (96.50), and the game rules are where the live version is shown. The figure on this page does not change what your own session returns.
Choosing a bet changes the money ceiling, because the maximum win is a multiple of the stake and not a fixed amount. Peking Luck's maximum win is a ceiling that is reached very rarely, so no bet size makes it a result to count on. Plan each session around the bet you can lose, not around the top prize.