In my opinion the bots are not the problem. They farm adena and sell adena, This is all.
The real problem is the ppl that in 2 week are lvl 58 FULL grade-C or B , while normal players 70% of server are lvl 25 / 35. (gludio server)
This lvl 58 ppl breaks the balance of the game, and for this is hard for ncsoft make a good balance adena/spoil.
In 10 years play L2 i not found any bot that no leave me farm o pk me for my spot.
The problem is make a good balance, NCsoft are trying to do their best and it is not easy.