Currently there are certain milestones that can be botted with no cost through the stage 0 regions - especially the armour and weapon forging. Infinite accounts could be created running scripts to farm this which could have a significant impact on the airdrop rewards to genuine spending pmayers
The play 10, 100, 1000, 10000 arena training games also fall into this catergory of easily botted
An easy solution for this is to change these milestones to point multipliers rather then points. This will mean accounts will still have to spend $$$ in normal runs and do the daily/weekly missions to actually benefit from these milestones