How do you know they don’t have logs?
They are easy and useful, so much so that most apps generate logs. E.g. my ~/Libeary/Logs folder has 76 items in it, but many of those are folders with tens or hundreds of items in. So a lot of logs. Including ones for the client and launcher.
Also they accept screenshot and video evidence of bad behaviour. But screenshots and videos are easily and often faked. Especially this game where the 2D art is very easy to manipulate. Accepting such evidence only makes sense if they can check it against logs.
They also are able to undo certain user actions. Deleting a char, releasing a pet, mis-spending some gold. They can only do this from logs (and the fact they can roll back these and not other things suggests what gets logged).