I think size of the jackpot is usually determined by how much money has been accumulated from players' bets over time. Progressive jackpots, for example, are funded by a portion of each wager made by players. When someone wins the jackpot, the prize pool resets to a predetermined amount and begins to accumulate again from the players' betsThe game itself, regardless of the size of the jackpot, is usually determined by its rules, gameplay, and overall entertainment value. Some games with smaller jackpots may be more appealing to players due to their unique features and exciting gameplay. It's also important to note that smaller jackpots may have better odds of winning than larger ones.