Is this intentional, or comedic, or something else?
What?!
Are you asking "why do I have to click on the image"? That's just precisely like http://2ch.net/. If it bugs you, click it, and bookmark the next page.
Or did you get to /net/ directly and don't have the frameset? In that case go to http://4-ch.net and try again, there is one.
Sorry, I forgot my sage.
It's because by clicking on the image, you agree to the TOS. Same thing with clicking "I Agree" on websites.