This is obviously not quite the same, but let’s not forget about the how they handled the bug where the new Guild Guardians could be pulled from Gold Chests.
On one hand, it can be seen as lenient and generous (because it was too hard to fix). On the other, honest players who didn’t abuse the bug missed out on essentially free resources (saving guild seals). I remember leaving that fiasco with the lesson that there are no consequences for abusing bugs like these. No one made a statement saying that what people did was wrong 
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EDIT: I was reminded of another exploit where they did ban players who abused the exploit hard. I stand corrected. Even back then, the devs did take action at times.