I think you're misinterpreting Section 230. Before Section 230, we also had Internet forums, we've had those since the late 1970's. The problem was the issue of censorship, people were suing when providers censored posts from the Internet or edited them without their permission. There has always been a subculture of people that believed that freedom is absolute, this caused Democrats to pass Section 230 which established "good faith" censorship. Note that Section 230 is so poorly written, SCOTUS has repeatedly stated it violates the first amendment and other laws and struck down significant provisions of Section 230 already.
Section 230 states that: No provider or user of an interactive computer service shall be treated as the publisher or speaker of any information provided by another information content provider.
No provider or user of an interactive computer service shall be held liable on account of—(A) any action voluntarily taken in good faith to restrict access to or availability of material that the provider or user considers to be obscene, lewd, lascivious, filthy, excessively violent, harassing, or otherwise objectionable, whether or not such material is constitutionally protected.
Without Section 230 you still have the free speech clauses of the constitution, what has happened is that, naturally, Democrats and content providers have taken the 'good faith' and 'otherwise objectionable' argument and extended that to everything they don't like while still getting the "not treated as the publisher or speaker". The argument on the right is and has been that if you edit a post, you are an editor and therefor liable for the content. We will just revert to the pre-2000s Internet where you could post whatever you wanted within the rules of a forum and if the service providers don't like it, they'll have to be honest and tailor their rules according to what they want on their forums. But right now Facebook etc have pulled a bait and switch and said to be pro-free speech but whenever someone exercises that right against their own interests, they find a reason to cancel them.