First one is a gray area, second one is a spammer. This is why we have human moderators and the flag button.
Anyway, it's sort of a moot point, as it's not really possible to automate elimination of those sorts of links.
the first one only started including other domains after being called out as a spammer, the second one is a clear case to me as well.
There are plenty more these two are only a small sample.
http://news.ycombinator.com/submitted?id=ravindra1982
http://news.ycombinator.com/submitted?id=insomniamedia
From a low wage country it doesn't take much to get someone to spend a few minutes / day to 'participate', and then to drop the 'payload'.