I hold the complete opposite view. The individual that uploaded the content should be held solely responsible for the publishing of that content. Should the platform receives a request for removal then by all means the onus would fall to them to make that decision. If the content is illegal then the platform should aid law enforcement with whatever information they have on the uploader. I don't believe it makes any sense to pre-filter content unless you're deliberately trying to create an opinionated platform (which btw is fine if that's what you want to do, but it shouldn't be a legal requirement).