Bonus timing, luck and the ceiling
Four SCATTER symbols anywhere on the 6x5 grid start the free spins, but no one can tell in advance when that happens. How often the bonus round comes is not known before a session, and the result of any one session is random, whatever the RTP. A player may see it on the first spin or not at all.
Three RTP versions exist for this slot, and which one is live is shown only in the game rules. The RTP is a long-run average over very many spins, so it says nothing about the result of one session. Check the rules section before you start playing, and read the figure for the version you are on.
50,000 times the bet is the maximum win of Gates of Olympus Super Scatter, a ceiling that a session reaches very rarely. Reaching it depends on the same random outcomes as every other win, so no spin or bet size makes it likely. Read it as the upper limit of the paytable, not as a target.