Unpredictable timing of the Free Games Feature
A 5x5 grid with 50 fixed win lines gives no sign of when the Free Games Feature will land. Nobody can know how often the bonus round comes, because the Santa's Sleigh Feature triggers at random while the reels spin. The result of one session is random too, whatever RTP version the game runs at.
Two RTP versions exist for Fat Santa. Which one this site runs is shown only in the game rules, so read them before the first spin. The version sets the long-run return over many spins, not what one session pays.
11,322 times the bet is the highest win Fat Santa can pay, and it is a ceiling that very few sessions reach. Treat it as the limit of the payout, not as a goal. A larger bet raises the cash amount at that ceiling.