Thanks my friend that you commented on this issue.
Yeah we can flag them but not as on individual basis. They have multiple numbers of accounts with lots of steem power in them. If you tried such thing then it will destroy your account totally.
I think we have to form some alliance which help minnows in earning a decent amount from the reward pool.
We can make slabs in our alliance based on reputation score or something else. It's the duty of upper slab to vote the lower slab users. Suppose we have 4 slabs, users of 2nd slab will vote for 1st slabs, users of 3rd will vote for 2nd and users of 4th slab will vote for 3rd and at the end users of 1st slab will vote for 4th slab.
In such a way we can help everyone and this alliance will also work for the rapists that are continuously raping. All slabs of alliance will start down voting them to curb these bastards.
I don't know how many members will support it, I don't know whether we can implement it or we can reach to the goals but we can start such thing to curb the bastards from the system.