https://www.techdirt.com/articles/20180418/23190739663/could-doj-be-violating-sesta-fosta.shtml

Last week, Gizmodo's Dell Cameron has a great report on how the DOJ's Amber Alert site was configured so stupidly that it could be used to redirect people to any website (this was also true of weather.gov and the National Oceanic and Atmospheric Administration). And it was being used. To redirect people to hardcore porn. Basically, the sites were designed such that just by knowing the right URL and adding a new URL to the end, it would redirect to those sites. Porn sites used this for a couple of reasons: first, since they'd now be getting referrals from high ranking sites, it can help their Google ranking. Second, because the primary URL would come from a trusted source again, it would help their Google ranking. And, finally, the links may look much more legit to people doing searches (though that would be more true of scam sites than porn sites).

Redirect scripts like this used to be fairly common, but they died off long ago. Except in the federal government. From Cameron's article: