As the title states, it is too easy to AFK farm (just spam Tab+Z repeatedly), and as more people get bored of grinding it seems like AFK farming is becoming more popular.
EDIT: @FatePGN gave an excellent explanation in another thread as to why it is actually not too easy to AFK farm (if you are a high level in a low level area), or to AFK level (if you are a high level in a high level area):
If you afk farm in an area (by holding down one key with a battery or something), it’s inefficient and no one will care, at the late game when mobs all use skills, it can’t be done anyway.
If you bot in the same map, then the Grim Reaper boss will summon for a set period of time, and will probably kill you. That is this games anti-bot.
Note: I tested this with a group of people by cycling level 15 call of deities scrolls between each other, and essentially killing them immediately, so we took over the map, and the grim reaper boss always summoned after killing too many enemies in one map, it spawns right on top of you.
If you kill him, you get no drops, but if your a player and actually manage to kill him, you get some okay exp, bots will have trouble with him as he summons magic mobs so they can hit even full evasion bots.
And @Midnightmare provided some more info about the Grim Reaper anti-bot/afk-farm monster in this thread:
There is actually a 1000 monster limit for staying in the same area and killing enemies within a certain time…Summons a grim reaper boss that does high damage, he takes around 5 minutes to despawn and spawns right next to your party. I believe the 1000 mobs must be killed in less than an hour