Technical difficulties while permabanning?

Afaik, there are permabans, but Humpelstilzche said, that it's incredibly difficult to actually implement them, because ip bans don't work properly. So, why don't you generate a token based on the user's hardware configuration (like the windows licensing system). I'm sure you guys @riot have thought about it, but I don't think it's implemented. Why is that?
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