Well, it's a Q research board, right? The purpose is Q research. The secondary purpose is to use as a tool to red-pill normies. I mean, you're going to have normal people from all walks of life show up to learn about Q and as they scroll through, how do you think they'll react to a bunch of random porn? It just doesn't look very mature for a movement intent on exposing corruption and satanic pedophile sex trafficking network.
I should add a bit more to my previous comment. I don't see this as a free-speech issue. Rather, I see this as a maturity/professionalism issue. After all, there is decorum for all manners of situations - from how to behave at weddings to dates to work. None of those are issues of "free speech" - it's about behaviour in certain circumstances, about how to restrain one's impulses for a greater good, about growing in maturity. Just because you have the freedom to do something, doesn't mean it needs to be done.