Internet marketing is awful.
I worked in that world for several years; I know the tricks. Just thinking about how much I could tell you about what really goes on behind all of the Shiny Happy Marketing People is absolutely wearying. It's enough for a book.
One technique to garner traffic is to create some generic piece of content, and then email all over tarnation to see if someone will use it on their website. There are a variety of ways marketers find and choose their email targets, some more thoughtful than others. Regardless, this is one of many reasons why you see what seems to be the same content everywhere on the internet.
I actually save those emails that I receive (and I get a fair number, since my name is on a lot of marketing blog posts from back in the day and people think I am interested) labeled as "great email examples", because some are so badly done I can't keep myself from going back and cherishing them. Clearly, the word "great" in the label is facetious. This arrived in my email today:
I'll admit I'm interested in an infographic on all of the ways internet marketing has ruined the internet. Shop that to me, and I might bite.