I have seen instances of (spam) users commenting the link of the question itself in the comment section and they are of course flagged and deleted. But I found a weird explanation of this in this post:
I couldn't help but ask, what is the point of such comments? If it is some spammer then they could have written some gibberish and vanish off from the site. Instead they do this and more often in bountied posts.
Update 1: Caught the user red-handed
Update 2: Based on BuckThorn's request, I am sharing some posts which had such comments and were flagged by me:
- Why does phenol react on oxygen in the Gattermann–Koch reaction?
- What can this chemical be? (Qualitative Analysis)
- What is the maximum number of water molecules that has been recorded till date to present as water of crystallization in a compound?
Update 3:
I found one case where the spammer tries to justifies their comment. Again, don't know what's the point of these comments. So, here is a screenshot of the comments before I flag for deletion:
userXXXXXX
, which later on revisiting the page, I get a reminder to sign up and claim the answer $\endgroup$