If you try to build that platform, you will get swamped by far right content, people casually suggesting how one could hypothetically obtain child porn if they

If you try to build that platform, you will get swamped by far right content, people casually suggesting how one could hypothetically obtain child porn if they had such illegal and immoral proclivities, and so on. You will then be boycotted by everyone, from your payment provider and advertisers to your more mainstream users, in a self-enforcing spiral until only unsavory content exists on your platform; nobody will lift a finger to help you, let alone offer you legal protection against such attacks. When you eventually run out of server money, the child pornographers will just move on to greener pastures. Everyone censors because everyone is a business and they want to maintain their content inside the Overton window where revenue is maximized and it's unlikely a boycott or political action against them will be successful.