This is where the GDPR has really helped me. I posted a comment on a blog critical of a government data sharing initiative. Nothing illegal, or questionable - it was a simple two sentence opinion comment which I posted under my real name. I didn't stop to think for a minute that it would cause me any problems.
It did. I discovered that I couldn't get to work on any government projects because when a background check was carried out on me, the above comment was found and according to Revenue (the gov agency responsible for such checks) it indicated that I was hostile to the governments IT plans.
I asked the blog owner (same country as me) to please remove the comment, they refused. So I submitted a right to be forgotten request to Google to stop the blog post appearing in searches for my name.