I'm sure I'm not the only one with this issue... I browse rennlist on an iPhone and frequently when I switch to a thread or change pages I am instead redirected to one of many ads that typically say something like "Congratulations, you're our lucky winner of the day" for a gift card or some such thing. The problem is they typically self-redirect and have a message box appear. A few self redirect dozens of times so I can't even get to the thread I clicked. Every time I get one I close the window. Sometimes I don't even bother to find the thread after that. This also happens at 6speed for what it's worth.
I'd really love these to die. Not because it's an ad but because it's flat out obnoxious to go to the silly ad in place of the content I requested and not be able to get out aside from blowing the whole browser window up.