About 6 months ago an acquaintance started a new blog (“professional” one) & I checked it out. She had been replying to all the pseudo-flattering comments. I didn’t have the heart to tell her they were spam, but I did mention Akismet.
It is a bit of a dilemma w/ this type of masquerade. If they actually take the time as you are saying, to pose plausible questions, is it really even spam any more in one sense? Luckily Akismet and others exist.