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How can this be done without hard fork? Can't accounts with high SP have bad rep as well? So accounts with bad rep will still get curation rewards?

If you do not earn any positive reputation by contributing to the discussion then your votes will be ignored in our ranking algorithm.

also would like to know where is this reputation stored? is it on the blockchain or website. I am assuming all this will only influence the website display ranking algo and not do anything on the blockchain level. I would like to see more info on how bad or good rep is gained.

Awesome!

Bots and botnets can be used to upvote comments and posts and inflate rep to allow for malicious flagging, which is what has been occurring for some time.