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Blanket removing Section 230 does literally the opposite. Without it platforms are only liable for user generated content if they moderate it. before if a platform moderated content published by users, it would be considered a content publisher, like a newspaper or magazine, and would be liable for user generated content. If they didn’t moderate they would be considered a content distributor, like a bookstore, which isn’t liable for the content of the material they distribute. So repealing it means any website with user generated content would effectively be required to operate like 4chan or Usenet.
No, because section 230 has been in effect since long before those companies existed. The law removes liability from companies who decide to moderate user content. If it were repealed they’d have to stop moderation or face liability. The Background and Passage Section on Wikipedia outlines the court cases that led to the law’s creation.