I guess you could always write "spam" as the reason under no reason since it does not really fit anywhere else.
I've muted a few people and under the the "no reason" I wrote "Because they're stupid and spam nonsensical dribble."
English
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But I do have a reason, and I can't specify it - that's the problem.
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Hmmm, I guess then post some constructive feedback ie don't whine "Ack Bungie y u no has opshun to le mute based on spam." So far, they seem to be implementing some of the changes that the community has had problems with ("Go dark" theme, specific forums instead of general hashtags). You seem to be on the right direction, so hopefully they do implement a "Spam" reason.
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You can specify it. That's what the comment box is for. If it breaks rules and other people block the person, then a moderator will see if it really does violate a rule. If it does, the person will be taken care of. If not, then you'll never have to see them again anyways so it doesn't matter.