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Remember we can't control how many accounts a person has and how many are bots, so any effort against truly deliberate abuse that relies on a per-account or per-post limit can be circumvented with more accounts generating more spam.

1 post per day, 10 steem max on all the post. Your precious spam network is not worth the effort and more ppl can get coffee money. And a monthly vote on whose account should be closed and balance burned, like witness vote but more witch hunt