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I don't know. I just learned about this from Khal. It has to do with front ends collecting information from the original Hive chain but may be a mechanism to prevent spam. Actually I think you did. I didn't see all your comments on INLEO before. Now I do.

If it's to prevent spam, it's not a bad idea. And I never thought about that or having anyone telling me about it.

As far as I know. It only affects those with negative reps for comments.

nope! It affects a bunch of new users not only with negative rep

I mean I didn't see notifications of your comments. I could see the comment itself. I use ecency for notifications.