Hmmm... Hive users blacklisting another user. That could be good, maybe more of a block feature is better? 🤔 What if random or new users just decide to blacklist anyone out of the blue though? There's got to be other conditions to be met before someone is blacklisted by anyone.
There is a "block" feature, it is called "mute" on hive.blog.
The blacklisting feature is actually less powerful: it doesn't block a user, it just puts a warning beside them. And be default, that warning is only going to show for the person doing the blacklisting. So it really doesn't matter if a new user blacklists someone, that warning will only show for them personally.
blacklists are in operation now on Hive. @blocktrades is basically proposing what you suggest: enabling users to choose what blacklist conditions apply to the blacklist filtering your feed. Right now, your feed is filtered by a blacklist(s) over which you have no input.