ditto that @schtauffenz
More people see the name, more people try it.
The botting issue has been around a while. I happen to have helped with this level of bot before. [Mita] D2NT was my version. Basic Diablo2 boss-running bot transformed into an unbeatable intelligent machine, which I'm still proud of regardless of the consequences. Unfortunately, the popularity of botting in D2 ended up putting regular players almost completely out of trading capability (though it was far easier to get good gear, just far harder to get the best). It drastically changed market values (Not an issue here). Most players were botting, which meant that getting a game with actual players was rare (kind of defeats the point of a multiplayer game doesn't it?). People stopped playing because there were only bots to play with (and D3 came out further splitting the player base, shame).
I have seen bot use in ranked-match games before too (or flat hacking), and the tendency is for the majority of ranked players to either quit playing ranked or go find the same programs. Take yahoo chess for example. 4k+ elo chess engines to play your games, beats grandmaster players regularly. No one played ranked for a while. Now its basically people betting on their engine for ranked games.
Starcraft BW had a 'hack' that detected other hack programs and was largely successful, even if said program still contained an optional map-hack and some cool booting hacks.
Mabinogi uses hackshield, which stops most hacks imh. Botting isn't a hack though and they faced it is a serious issue for a long time. They tried an in-game timer 'bomb' that players could buy from an npc and use on a suspected botter, who had to answer a question within x seconds. It technically worked against most bots, but very impractical, and largely considered insulting if misused on normal players. Botting there has died drastically mostly due to market value changes from game updates. Funny really.
Ultima Online (come on out you old-school nerds) buffed their server protection, on top of a programming-format rewrite (to trim down access to coding only to other pieces of code or otherwise as needed). I dare not say what the free servers did, since there have literally been thousands of those. A lot of servers have a stance about botting that works well in that game though. GM's occasionally 'sneak up' on players (instant tele to player) and observe them while undetected. Botting rules tend to be limited to skill training and hotkey (as opposed to say, auto blink). GM's actually TALK to players if suspected. Some servers have capcha or other tools they can use too.
Diablo2 actually had a server dedicated to attaching to random games (much like CloneD) and scanning the players for hack usage. I've seen coding somewhere to detect the server and leave game. lawl.
Well Of Souls, created by Dan something (i know only cuz we share a name) uses hexidecimal programming. After people started hacking his game, he built a code-checker into the coding itself. I never did find where he hid it. I actually suspect there were more than one instance. It was however, insanely effect at stopping the hackers, and stopping data-editing (like setting your stats to their cap normally achieveable in-game anyway) Botting, however, pretty much remained the same (even if thats not an issue to that game).
Sidenote: Blizzard denied my job app as a programmer. :D