It's really a textbook example of content marketing. Mind you, they have a good service to go with it. But the visibility they get from things like their hard drive stats is worth a huge amount.
People severely underrate content marketing in my experience. Or misunderstand it. Just having a popular technical article on your business domain is good. You don’t have to do anything clever in the article itself marketing your business.
I miss Basho: we’d frequently post quality distributed systems content on our blog, and running the RICON distributed systems conference was quite a privilege.
> It's really a textbook example of content marketing
It's a textbook example of excellent content marketing. Not many services can do it like Backblaze, because not many services have something this interesting to write about.
Good content marketing should be a positive force. Done well, it's win-win. Readers (including potential/current customers) get interesting/useful content; you get your brand out there at usually fairly low cost.