Ha! I have a ridiculous amount of insight into this =)
For over a decade now I've been building and leading Developer Relations teams at developer companies. The reason why so many startups have a blog is because... It's one of the best ways you have to attract users to your service in a high-ROI way.
Think of it like this: you're a startup founder for a developer company. You want to get developers to know about your product, and ideally, try it out. How do you do it? You have a handful of options!
- Paid Advertising (expensive, hard to manage, immediately stops working once you stop advertising)
- Cold outreach (aka, outbound sales and prospecting, it works but nobody likes it and it's labor/time intensive, immediately stops working once you stop it)
- Organic outreach (aka, blog posts, YouTube videos, etc.) When I ran DevRel at Stormpath (acquired by Okta), and later Okta, here's a fun secret most people won't know: a majority of our business and new developer users came from our developer blog. Shocking, right? Even at a large post-IPO company like Okta, the developer blog (back when I was there, anyhow), represented a massive portion of ALL website visits.
The amount of influence you have through educational content is truly massive, and can make or break even the largest tech companies.