I'm reminded of a Usenet campaign in the mid-late 90s, adding hot terms to sigs.
But not, at least, on no-fly lists.
Look out the window. They're in the ice cream truck.
In other words, I don't think your solution is very good. It might delay things a few minutes or hours at best.
1) I would bet our web filter would be sending me some reports
Funny would be googling fetish porn, not funny would be banning you from international travel.
But it wasn't evident at all to me that it was a site that would do what it apparently did.
It seems like having a link like that on a major, moderated website like hn is a serious problem and failing.
It was not labeled "Show HN" or anything, and apparently only required opening the link (I did not open it myself).
Edit: I guess I was misinformed about this last - micaeked says that you have to click a button on the page.
I still don't get why something so malicious was upvoted so much.