For battle mode, the number of trophies won by the winner is equal to the trophies lost by the lose.
Therefore when battling between players, the sum total of trophy count remains equal.
If the system was closed, players could only achieve higher leagues by shifting the distribution of trophies from the weak to the strong.
However, it is not a closed system: trophies won from bots are added to the sum total and trophies lost to bots are taken away.
I’ve been experimenting with a new tactic: for the first 20 or days of the season, I try to win against AI and lose to human players.
This should have a minor effect on adding trophies to the sum total.
It keeps the AI matches relatively easy, and let’s some players have a free win and maybe get a new league’s rewards.
I wonder what would happen if more players implemented this strategy.