alt Hacker NewsThe product never purports to show you the news directly, and the reaction of "the other side largely… publish[es] a lot of nonsense" is a) not true and b) why the product exists. For that matter, the dichotomy you have in mind is not even valid in the first place.
If what you say about the audience composition and the general background situation were at all true, it would be impossible for them to find sponsors, because it would require YouTubers who depend on appealing to a partisan audience to deliberately seek to betray them. And if what you say about the product were at all true, it would again be impossible for them to find sponsors, because none of the YouTubers would be willing to endorse the product.
If anything, the problem with Ground News is that they buy into the same categorization scheme of the news that you do, perhaps with a different bias but the same clustering and same false impression of a single-dimension spectrum.
The product ads definitely purport to show you news.
You deliberately misunderstand the point about advertising audiences, that is not how advertising audiences work, at all. The point about influencers rejecting shady sponsors is also false, and circular. All evidence suggests they mostly accept sponsors who offer money.
If Ground News "bought into the same categorisation that I do" there would be literally no reason for it to exist. It exists to change the categorisation you buy into.