FFXIV also bans RMTs in mass. 52,816 accounts have been permanently banned so far this year, but these are different than blanket, indiscriminate bannings.
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For each one they ban 10 more will pop up. Making these bots is easy and they can run a bot program constantly making new characters and running them through the game. They also can't just ban people based on a name or a report the need to prove they are doing something that is bannable. Another reason to take their time is to try to learn about the methods they are using though the people who create bot programs and hacks will always be able to find new ways to do things as bugs are patched.