Spammers exploit open redirects on US government websites to redirect gullible web users into visiting make money fast websites. Spam accounted for 15.1 percent of all 1.usa.gov URLs as of 18 October. 43,049 clicks were redirected to spam domains through these shortened 1.USA.gov links. US citizens are the most likely to fall for these spam messages, with those desperate for $87/hour jobs accounting for 61.7% of click-throughs.”]
Source: https://nakedsecurity.sophos.com/2012/10/23/spammers-exploit-open-redirects-government/