Here is a legality question for you :

[Kinky]

Originally Posted by [BV]

Yes quite true and a good point, could be considered a traffic leak.

Do you think that's what's going on when you see a mainstream advertisement do that? both parties involved maybe?

I haven't really seen it so I have no idea but just substitute "all the other INSERT NICHE HERE sites" for "mycompetitorssite.com" and the potential leak is gone along with any legality issues