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They have.
https://steemit.com/utopian-io/@themarkymark/global-blacklist-api-now-supports-utopian-io-blacklist

The Global Blacklist API is an interface for Steem related projects and services to be able to query multiple blacklist projects to identify bad actors.

Yeah but that is innacurate out of date last I checked and mostly just flag wars not really bad actors. Many many many bad actors skate by while innocent accounts are wrongfully accused.. I will use any data source for input, but we manage our own blacklists for this very reason! To ensure no LEGIT accounts are placed on the blacklist!

Correct. Some could pick lists from SteemCleaners, buildawhale etc. But it's still their lists with their rules behind and their agenda.

Using it as a input, filtered, should be the right approach to reduce the abuse of SB without getting involved in some flag wars.

This is why we compile our own lists and have our own abuse detection and filtering techniques.

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