When i click on a forum to see the things the creator of the forum made,i see an ad saying "buy a rule34 shirt",safebooru is sfw,how is this ad in safebooru?

Beacuse it's a booru,and rule34 it's the bad brother of safebooru

And someone in the forum linked a r34 site

rule34.xxx is owned by the people who own safebooru.org

which is probably also why the tagging on this side is complete dogshit.