I agree it's hard to regulate this, but I feel that this is not even a problem "how should we ban people who abuse voice chats". To me, its a reflection of how we feel comfortable saying things like this on voice chats over a game. I don't have a solution to this behaviour, and I'm sure riot is searching for one without being too extreme. But I'm way more concerned by the reactions to this behaviour. As I said in a comment below, it's sad to see how so many people are blaming her for unmuting and forgetting that this man felt it was appropriate to threaten her with rape over a video game. If there was more social pressure, and we collectively called out and rejected bad behaviour like this, people like the man would really not feel brave enough to say this shit on voice chat in a game.