Proof / refs?

Their founders (Brian Halligan and Dharmesh Shah) are credited with defining "inbound marketing."

Here is the original version of their book: https://www.amazon.com/Inbound-Marketing-Found-Google-Social...

Not proof, per se, but the term to look up is "inbound marketing".

HubSpot was very big on pushing companies to publish lots of content like blog posts and then having calls to action for people to submit their info in exchange for a whitepaper download or similar. Predictably if your main goal is to consistently publish blog posts and whitepapers to generate leads, and you don't have a strong culture of quality and good writing, it's going to lead to lots of slop (even before you could automate writing it with AI).

That being said, I'm not sure how much to blame HubSpot vs. this just generally having been a marketing approach/idea that was "in the air" while it sort of worked (for some definition of "worked"). I sort of remember a handful of companies at the time doing pretty good blog/content marketing by writing useful and thoughtful stuff, and then lots of companies going „got it, make blog and profit!“. But possible that the HubSpot push accelerated that a lot — I don‘t feel like I have a good intuition about that part.

See e.g. https://www.hubspot.com/inbound-marketing