the rewards are only reduced if more than 50% of the respective players or bots remain in the ranking. in return, the rewards in the other ranking would be higher. how long do you think it would take for more players to switch to the ranking? this way, the rewards would roughly balance out again in the end... 

and this argument with the 100% not to catch is just a deception. imagine we would abolish all safety measures in the world that do not protect 100%. traffic lights gone, airbag gone, seat belt gone, police gone, etc etc

in addition, you have the problem that we constantly have to implement new things to mitigate the damage of the bots. which costs a lot of work and also makes it difficult for new players to enter each time!