It is different when real imminent harm to real organisms in the actual real world is involved

If someone is posting that crystals will cure your cancer, or you can feed your baby honey to build its immune system, or vegan cat food is safe, it is a good admin’s job to curtail your free speech rights unless you can demonstrate pretty convincingly that you are not the wrong one (with more than “I KNOW bro, I’m vegan, so that means I’m right and stfu”).

And doubly, triply, so if you are actively censoring people who are trying to debunk your misinformation through exercise of their own free speech.