How often will the bonus round land?
Four or more SCATTER symbols start the Free Spins, but no one can know in advance how often that happens. One session may reach the bonus round on the first spin, or never at all. The result of a session is random, and a higher RTP version does not change that.
Four RTP versions exist for this slot, and the version Goldbet Casino runs is shown only in the game rules. Open the rules screen in the game before your first spin to see which one applies to you.
x25,000 is the ceiling of the maximum win, counted as a multiple of your bet. Players reach it very rarely, so read it as the outer edge of what the game can pay, not as an expected result.