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I disagree, many comments that look authentic are purely because they know the author is known for upvoting commenters.

In parts of the German community it is for sure different. The few fake commenters are ignored and sooner or later they give up.

There are of course exceptions to everything.

Really? When a comment says "Great post" is that actual feedback or just spam? I honestly can not tell.

Who cares, they won´t get upvoted anyway, so no reason to waste time on them.