> Has anyone had similar or shared experience like these?

I hardly ever respond to those, but I did get a bad actor the time I commented on its companion monthly post, for people who were looking for work.

Some startup was scraping the HN post and putting up profiles for all the people on their own site, with the appearance that the people had put the profiles on the site themselves. I guess probably to bootstrap a user base.

(I like to imagine that they had investors who lost all their money on this team, as negative feedback for funding people with no intuition for ethical behavior. Our field certainly could use more such negative feedback.)