Repealing 230 from certain platforms (or in its entirety) will make these platform responsible for content hosted on them. Secret twitter facebook, and instagram accounts passing CP around? Well guess what happens next. As usual, people argue back and forth over what @POTUS did was an abuse of power or a tantrum or within his legal right. All the while, the NSA lays a report on his desk with all the accounts guilty of passing snuff and CP around.
Oh, and if you think ending 230 provisions won't bring sites like PornHub down, you've got another thing coming.