Affiliate links (not only hoplinks) could be successfully cloaked/hidden using this tool. More details there.
This one is smart idea to cheat adware (PPV) url scanner. You know, some affiliates using PPV or adware are bidding on vendor's domain name or even nickname.
So, there is no doubt that they want to steal commission. What happens if you don't provide that info (landing pag url) to installed spyware url scanner?
10-30% (otherwise stolen) commission saved. That script is not free, but sales page is very informative.