I have been wondering this too. Especially because there is no way to mark posts as mature just yet. I personally dont like how vague the rules are and how accessible those threads are if all someone has to do is write “18+” and hope for the best. I know a mature filter will get implemented because I heard a mod say it’s a planned feature, and I hope that happens because that would be awesome. But in the meantime I fear that with the current looseness of these rules, something bad could occur. Nothing has though to my knowledge, which is good, so I could just be overthinking it, but yeah, those are my thoughts.
— matpat