One reason to use well known sites for such links at least for me is that I'm not familiar with the field and can't for myself review how significant or well done the study is and can't parse it that well. So I kinda have to outsource that and hope the more repubtable sites have some knowledge about what they're reporting.

I know CNN isn't great but it's well known and at least somewhat reputable, which makes me think the study might have something going for it. With sites I haven't heard of that's more difficult for me to gauge.