Mute list is public per NIP-51
Discussion
Strange, because in nostr:nprofile1qqsgv975dd0wlfsaqav4j9wqj6seh8rtk4vsnen7534y936lv8x6uhg5054nh client is private and I think should be private.
cc nostr:nprofile1qqs89qlxtkn8lmvn5pdc3d5tpy3jy7v8jd2ypecrcnzy9vep3u99a8s9ugt9u