Tibia
Some random thoughts because I'm kinda busy
Game is great and insanely addictive(seriously, I can talk about this more if youre interested), but community on private servers is insanely toxic and uneducated (I don't really like saying this like that, but seriously that's something you tend to do not experience in other games) due to... well, that's interesting topic.
This game has relatively high entry level because it's like 23 years old game which has A LOT of content, even more if you do not use spoilers for quests/missions.
If you don't play on private servers, then you have to buy "premium account" to be able to play the game to its full potential which costs like 10 euro for a month
Dying in this game is very punishing, but it used to be worse like decade ago because nowadays you can buy ingame_currency relatively cheap. Dying decade ago without "protections" could waste your like 2-3 hours of exp and some items, add to that fact that you can be killed on PvP servers by anyone "just because" :P
This game is also interested from programming perspective -
Private servers are an initiative by programmers to recreate this game engine and host their own server. Nowadays it's mature.
One of the most popular private server engines: https://github.com/otland/forgottenserver
It's really impressive project.
When it comes to botting FULL afk scripts
You have to write code which goes to the exp place, don't get stuck somewhere, exp there for a hours (using spells, drink health/mana potions, take loot from corpses, run on the more or less complex spawns (map), go back to the city if you don't have potions, sells loot, take cash to the bank, and repeat
Many things can go wrong during that cicle - like other played blocked your "road" to the exp for 1min, or you character just died due to PK(players), lag and maaaaaaaany other.
Your script has to consider a lot of those different conditions and trade offs (sometimes you don't want to kill monsters that are between your city and your spawn because it would take 10min, so you just want to run through them, but you can get "trapped" (sorrounded) by them, so you have to consider this)
It's not easy to do this good enough that you can start bot on VPS and it will running for a day, week or something similar.