I don't know, but one of the most consistent patterns I've seen with chud posters, the kind that have just about zero post history in a place they get chuddy in until they post their chuddery, is tons and tons of nfl/nba or team specific fansubs.
My hypothesis is "social engineers" and freelance chuds build up karma points by nodding along in sports subs then go to /r/antiwork or /r/fuckcars to do one off bootlicking posts. It's weird but otherwise I don't understand the pattern.
Yes, they are chud magnets because America is chudville.
Ironically enough, American soccer fans tend to be less conservative than European ones. A byproduct of being a fringe sport until recently, only watched by immigrants and college students.