How is it not? I'd think it would only be harmful if they are able to earn from those posts and then are constantly selling their earnings thus devaluing the economy.

I'm not saying it isn't annoying. Sure, it creates a lot of clutter and no one genuinely reads garbage posts like that so it doesn't add any value to the community but to say they hurt the community isn't really valid either. People generally only look at the top trending articles of any news site or they are looking for an article covering very specific topics.