Presently blacklists are global. The same blacklist that filters your feed filters mine, and neither of us chose to apply it. @blocktrades proposes that we choose whether our feeds are filtered by blacklists, and which filters apply. One user would no longer force every Hive account to be filtered by the blacklist they make, as happens now.
Your choice of filters on your feed does not now affect my feed, and would not after this proposal is adopted. Right now both of us have filters on our feeds we did not choose and cannot change. Right now abuse could happen.
After we can choose what filters our feeds, abuse can no longer happen.