This mischief with insta-dolphin/orca/whales using their steem power to flag people - I say, don't worry about it for the short term. The moment they stick their head over the parapet with a post they are gonna get what's coming to them. Also, this is why I think that the upvote/curation reward and obverse, downvote, should have a curation FEE. I don't think it would be that hard to add a debt claim object to the database, especially one that is created by the users' activity. This could get rid of a lot of flag abuse, in my opinion, because they would have to pay some cost for their indulgence.