Downloadable link (where they dont know up front what could be inside that) or Referral link (where they can see what they are clicking upon & even google that site even before clicking on that referral link)
Both ref. links and malicious links aren't allowed on the forum, while the latter is bit harder(time consuming) to moderate. You can question all you like but as several members have pointed out, they aren't going to change without majority agreeing/"nagging" admins to change them, which isn't the case here.