HN, a few subreddits, and a few specialised sites.
There isn't a lot of long-form technical journalism happening in print today. Web distribution is cheaper and simpler.
With print you have to lay out a page by hand - and I have no idea what they used before Quark/InDesign, but it can't have been easy to work with - get it printed to film for litho, sometimes with a few iterations, handed over to a trad printer, then distributed physically.
With the web you can upload text and images to a CMS and the layout can be handled automatically. And you're done. Ad revenue can also be automated, with manual exceptions for sponsorship deals.
Ironically producing videos for YT is a much more labour-intensive process, and therefore more like print, than plain web content.