The mechanism steemit has is due to the fact it costs 3 STEEM to create an account. If they get a lot of spam accounts, it will be costing them money.
That sounds like blocking spam accounts to me. Aporeciate your reply.
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You are correct .... paying the 3 STEEM is an economic incentive to not open 1000 accounts. The only real way to spam is a direct memo but that still cost 0.001 STEEM and is not highly visible. For any account you choose not to follow or can mute their posts if you find it spammy.