Ok, but the whole idea of Fediverser is to let people get rid of Twitter/Reddit by giving people an alternative source of content. Sending content there would make those platforms more interesting, not less.

But why would you want your comments to be on Twitter?

If you mean that posts on Lemmy would be mirrored to Twitter, no.

a lot of low-quality posts that have been vetted by no one

It would be posts made by relevant reporters. So some type of vetting has been done already - by their own editors. ;)

Also: this could be implemented in a way that only presents a queue of posts to moderators, and moderators could then choose what gets published.

quality of Twitter and Reddit deteriorating

This is not really relevant. The idea is to get just the posts from the sport reporters, not the whole comment thread.