A company should not be able to act like a publisher and determine what stays on their service and when someone sues them for libel they claim they're not a publisher and hide behind the shield.
[1] https://en.wikipedia.org/wiki/Section_230
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> At its core, Section 230(c)(1) provides immunity from liability for providers and users of an "interactive computer service" who publish information provided by third-party users
> 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.