Everyone is a unique comment by a real person, more so than can be said about actual Hive comments in some cases.
If you open up each one of those hidden ones, they will all be unique comments by real people.
But you chose one extreme post from 3500 comments/week. Most posts only have one or two @poshbot comments at most. Even that being the case, these are still valuable off chain comments brought on chain.
I didn't cherrypick those examples. Went to the trending page and took screenshots of the first two instances I found. Spent more time cropping than anything. What I saw was similar to what I've been seeing.
I can see those two 'unique' comments. When you read them, you can see why I called them advertisements. I most certainly don't use that term in a negative light either. I respect those efforts and have written about the importance of reaching an outside audience starting over four years ago. So this is progress and it's good progress. I don't like the spam. Nothing you say will change that so let's not argue and move on from there. I see potential and view this current method as only the building blocks to something much more beneficial; bigger and better. So I suggest these things. Not interested? That's cool with me. Didn't come here to shit on your plan or piss in your cornflakes. I just think it can be better.
When post is shared 2nd (or 3rd, 4th...) time you should edit first comment and add a text link to twitter, this way poshbot will leave only one comment under every shared post and will link to all shares