I think once a post passes 10 upvotes, flags are no longer relevant. My guess would be that the posts are gaining upvotes fast enough (15+ upvotes a minute) tha

I think once a post passes 10 upvotes, flags are no longer relevant. My guess would be that the posts are gaining upvotes fast enough (15+ upvotes a minute) that HN's anti-spam triggers are going off.