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Particularly, why I was suddenly blacklisted after more than 2 months of inactivity!

You were probably blacklisted a long time ago and just never knew it. It's this new (software) version they just implemented that shows the red (1) next to your name that now makes it into a "scarlet letter".

Marky's pushing for a "grand-unified-master-blacklist" across all the major front-ends.

Details here,
https://steemit.com/sps/@themarkymark/global-blacklist-api-proposal#@themarkymark/q6fmzx

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I think the flag has the potential to be useful.

Of course it sounds like a good-idea, but these are just a bunch of self-appointed yahoos who can make exceptions for themselves and their friends at will and enforce their opinions on the rest of us with capricious and tyrannical abandon.

If the blacklists were controlled by the witnesses exclusively, then at least we'd sort of get a "vote", and we could advocate for a transparent appeals process that included some "innocent until proven guilty" procedures along with a standardized "road-to-redemption" for those found "guilty".