I get why they do this, suicide prevention is no joke and should be handled by people that trained for it, some commenter trying to help could cause a lot of harm without meaning to do so and someone that's not in a good mental space could become triggered and/ or spiral into suicidal thoughts themselves after reading these kinds of subjects.
That said, perhaps the mods could link suicide prevention hotlines from all over the world (as you already do for different resources on -TherapyNeurodegenerative Disease Support, ADHD, Autism, Fibromyalgia, etc.). If I were me, Id put those as front and center as posible, and as easy to find as posible by those who need it (say, quote it after the rule about suicide, include it in the resources given, maybe highlight it).
Suicide.org has some great guidelines on how to mention suicide in the media (not the same thing as a mental health forum, I know, but I personally find them very useful regardless when it comes to discussing anything suicide-related on the internet, where you never know who is reading your content).
And remember, if you or someone you know is feeling suicidal, there's help out there! there's people willing to work with you to get through this, please reach out to them.