I don't think a mute/block list passed around relays is good, but I don't see any harm in a public mute/block list on someone's profile, similar to follow lists. In fact, I think making blocks and mutes public is key. It's very transparent.
Discussion
Yeah. I can imagine a block list being like how I was banned from Twitter with no recourse because no human will bother to even review the situation.
My wife was banned for JOKING to stab me in my sleep for posting a boob meme, and then a month later when she logged into my account on her phone I was banned under the evading suspension policy.
Multiple attempts to explain, but I just got the same for response. A block list would be the same on big relays. No man power or motivation to look into the justness of any decision.